More than one log file is created in the same minute

Hello all,

I am using SQL Server 2008 Enterprise edition. I have scheduled log backup for hourly but i am getting the number of log files in the same minute as shown in below.

EDB002_**_DB_LOG_20160207_000000
EDB002_**_DB_LOG_20160207_010000
EDB002_**_DB_LOG_20160207_020000
EDB002_**_DB_LOG_20160207_050000

Any one please help me in this.

Thanks,

Ganesh