Initial Synchronization

I have the Synchronization set with a filter to use an OU in the source domain with a few accounts that I have migrated and the job direction is Source to target. When I start the Synchronization it shows that its performing the initial sync. But when I look at the dsa.log it shows that the job is comparing against accounts in the source domain that are outside of the filter. Is that normal? I have stopped the job and I did not want to continue until I know that it will not compare against all of the accounts in the AD domain.