Trigger to insert records is not working

I am trying to set up a trigger which will run after records are updated by a Applications.  I have never built a trigger before nor have had much experience with SQL. 

What this script is supposed to do is after a record has been updated, it uses the data in the HPLC_Params table to insert some of that data into two other tables.  Those tables being ctc_MdeHeader and ctc_MdeData.  

USE [ctc_custom]
GO
/****** Object:  Trigger [dbo].[trg_InsertLabData]    Script Date: 3/4/2019 8:28:33 AM ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author:		Cam Evenson	
-- Create date: Feb 28, 2019
-- Description:	Trigger passes records into the MDE tables
-- =============================================
ALTER TRIGGER [dbo].[trg_InsertLabData]
   ON  [ctc_custom].[dbo].[HPLC_Params]
 AFTER UPDATE  

AS 
BEGIN
	DECLARE 
		@MDEtype VARCHAR(50),
		@HeaderID int,
		@SampleName VARCHAR(10),
		@source nvarchar(30),
		@tagid nvarchar(30),
		@InsertTime datetime,
		@StringValue nvarchar(30),
		@Quality int=192,
		@Computer nvarchar(50)='',
		@UserName nvarchar(50)='',
		@DbUTagId int,
		@DataType int,
		@UseStartTime bit,
		@headerSourceId int,
		@Time nvarchar(25),
		@RecordKey nvarchar(80),
		@TestID as int,
		@MdeHeaderId int,
		@UTagId int,
		@TagLETTER nvarchar(5),
		@CompoundName nvarchar(30),
		@LabTagName nvarchar(30),
		@RecordCount int
		

		SET @MDEtype = (SELECT Top 1[Destination] from [HPLC_Params])
		SET @SampleName = (SELECT Top 1 [SampleName] FROM [HPLC_Params])
		Set @HeaderID = (SELECT Top 1 [utagid] FROM [ctc_config].[dbo].[ctc_processtags] Where [name] like @MDEtype)
		SET @InsertTime = (SELECT [Analysis Date] FROM [dbo].[HPLC_Params])
		SET @TestID = (SELECT [TestID] FROM [dbo].[HPLC_Params])

			-- Create the recordkey based on the time stamp
		Set @time=CONVERT(nvarchar(25),@InsertTime,114)
		Set @RecordKey= CONVERT(nvarchar(25),@InsertTime,12)+substring(@time,1,2)+substring(@time,4,2)+substring(@time,7,2)+'00'  ---substring(@time,10,3)

		SELECT 
		@DbUTagId = t1.utagid, 
		@DataType = t1.datatype,
		@UseStartTime =  hs.SelectByStartTime,
        @headerSourceId = hs.Id
	FROM 
		[ctc_config]..ctc_v_processtags t1 (NOEXPAND) 
		INNER JOIN 
			[ctc_config]..ctc_dssource t2 
		ON 
			t1.dssourceid = t2.dssourceid 
		INNER JOIN
			[ctc_config]..ctc_mde_tagheadersource ths
			INNER JOIN	
				[ctc_config]..ctc_mde_headersource hs
			ON
				ths.HeaderSourceId = hs.Id
		on
			t1.utagid = ths.ProcessUTagId
		WHERE  t1.name = @tagId AND t2.name = @source
		
    If @DbUTagId is null or @headersourceid is null Return	

		BEGIN
			-- SET NOCOUNT ON added to prevent extra result sets from
			-- interfering with SELECT statements.
			SET NOCOUNT ON;

			--	Configure which MDE the data is assigned too
			If UPDATE([Validation]) 
				
			
					If @MDEtype = 'Evaps'
						-- Shift values to Evaps MDE
						Set @headerSourceId = (SELECT [Id] FROM [ctc_config].[dbo].[ctc_mde_headersource] WHERE [Name] = 'Evaporators')
						
					If @MDEType = 'P-311'
						-- Shift values to Fermenter MDE Yeast Spot 1 & checks if there are more then one sample
						Set @headerSourceId = (SELECT [Id] FROM [ctc_config].[dbo].[ctc_mde_headersource] WHERE [Name] = 'YeastProp')
						Set @MdeHeaderId = (SELECT [Id]  FROM [ctc_config].[dbo].[ctc_mde_header] WHERE [ProductLabel] = @SampleName)
					IF @MDEtype  = 'A'
						-- Processes Fermenter Letter A Values
						Set @TagLETTER = 'A'
						Set @headerSourceId = (SELECT [Id] FROM [ctc_config].[dbo].[ctc_mde_headersource] WHERE [Name] = 'FermA_MDEG')
						Set @MdeHeaderId = (SELECT [Id]  FROM [ctc_config].[dbo].[ctc_mde_header] WHERE [ProductLabel] = @SampleName)
					IF @MDEtype = 'B'
						-- Processes Fermenter Letter B Values
						Set @TagLETTER = 'B'
						Set @headerSourceId = (SELECT [Id] FROM [ctc_config].[dbo].[ctc_mde_headersource] WHERE [Name] = 'FermB_MDEG')
						Set @MdeHeaderId = (SELECT [Id]  FROM [ctc_config].[dbo].[ctc_mde_header] WHERE [ProductLabel] = @SampleName)
					IF @MDEtype = 'C'
						-- Processes Fermenter Letter C Values
						Set @TagLETTER = 'C'
						Set @headerSourceId = (SELECT [Id] FROM [ctc_config].[dbo].[ctc_mde_headersource] WHERE [Name] = 'FermC_MDEG')
						Set @MdeHeaderId = (SELECT [Id]  FROM [ctc_config].[dbo].[ctc_mde_header] WHERE [ProductLabel] = @SampleName)
					IF @MDEtype = 'D'
						-- Processes Fermenter Letter D Values
						Set @TagLETTER = 'D'
						Set @headerSourceId = (SELECT [Id] FROM [ctc_config].[dbo].[ctc_mde_headersource] WHERE [Name] = 'FermD_MDEG')
						Set @MdeHeaderId = (SELECT [Id]  FROM [ctc_config].[dbo].[ctc_mde_header] WHERE [ProductLabel] = @SampleName)
					IF @MDEtype = 'YS'
						-- Processes Yeast values
						Set @headerSourceId = (SELECT [Id] FROM [ctc_config].[dbo].[ctc_mde_headersource] WHERE [Name] = 'Liquefaction')
				--Create a new header for this timestamp
			DECLARE @RC int
			DECLARE @InsertResult int
			DECLARE @RowVer timestamp
			DECLARE @ProductLabel nvarchar(50)
			DECLARE @StartTime datetime
			DECLARE @EndTime datetime
			DECLARE @GradeNameId int
			DECLARE @ManuallyModified bit=1
			DECLARE @AllMdCellsHaveValues bit=0
			DECLARE @UpdateWhenExists bit
			DECLARE @ModificationType nvarchar(20)
			IF @UseStartTime = 1
			Set @StartTime=@InsertTime
			Else
			Set @EndTime=@InsertTime


			EXECUTE @RC = [ctc_config]..[ctc_sp_MdeHeaderInsert] 
		   @MdeHeaderId OUTPUT
		  ,@InsertResult OUTPUT
		  ,@RowVer OUTPUT
		  ,@HeaderSourceId
		  ,@RecordKey
		  ,@ProductLabel
		  ,@StartTime
		  ,@EndTime
		  ,@GradeNameId
		  ,@ManuallyModified
		  ,@AllMdCellsHaveValues
		  ,@UpdateWhenExists
		  ,@Computer
		  ,@UserName
		  ,@ModificationType
  
		  If @MdeHeaderId is null Return

	WHILE @TestID is not null
		BEGIN
		  -- We now have our new headerId, we can now stuff the new value
		  -- Loop through the Data values and insert them into MDE Data
		DECLARE @Id int
		DECLARE @Comment nvarchar(1024)='HPLC_Write'
		DECLARE @NumericValue float
		DECLARE @EntrySource tinyint=2
		DECLARE @ReadOnly bit=0
		DECLARE @OverrideReadOnly bit
		DECLARE @DateTimeValue datetime
		If @DataType is Null or @DataType<>8 
		Begin
			--	Set the Numeric Value of the Lab Data here
			SET @RecordCount = (SELECT count(*) as 'Records' FROM [ctc_config].[dbo].[ctc_mde_value]
				WHERE [MdeHeaderId] = @MdeHeaderId GROUP BY [MdeHeaderId] HAVING count(*)>1 )
			SET @CompoundName = (SELECT b.CompoundName FROM [ctc_custom].[dbo].[HPLC_Data] a join [ctc_custom].[dbo].[HPLC_Compound] b
									on a.CompoundID = b.CompoundID WHERE a.TestID = @TestID)
			SET @LabTagName = UPPER(@TagLETTER + '_' + @CompoundName + '_S' + @RecordCount)
			SET @UTagId = (SELECT [UTAGID] FROM [ctc_config].[dbo].[ctc_processtags] WHERE [Name] = @LabTagName)
			SET @NumericValue = (SELECT [Amount] FROM [ctc_custom].[dbo].[HPLC_Data] a Join [dbo].[HPLC_Compound] b on a.[CompoundID] = b.[CompoundID] WHERE a.[TestID] = @TestID 
			AND b.CompoundName = @CompoundName)
			Set @NumericValue=Cast(@StringValue as Float)
			Set @StringValue=Null
		End
		-- TODO: Set parameter values here.
		--	Loop through the Lab Data
			EXECUTE @RC = [ctc_config]..[ctc_sp_MdeValueInsert] 
			   @Id OUTPUT
			  ,@InsertResult OUTPUT
			  ,@RowVer OUTPUT
			  ,@mdeheaderid
			  ,@DBUTagId
			  ,@NumericValue
			  ,@StringValue
			  ,@Quality
			  ,@Comment
			  ,@Computer
			  ,@userName
			  ,@EntrySource
			  ,@ReadOnly
			  ,@OverrideReadOnly
			  ,@UpdateWhenExists
			  ,@DateTimeValue
			END

		END
	END

I am looking for the update of the field Validation from Null to have a value.  Would like to get this working, as right now when the trigger is added to the Params table the validation software does not update the values in the Params table.