Problem with chris chapter 4

#1SnizMasterJPosted 1/20/2013 8:38:55 PM
So I have played chris chapter 4 like 3 time now co-op on normal and not once has it registered that I beat it. I even joined in co-o on chapter 3 and plaed through chapter 5 and it will count that I have beaten it.

Does anyone know what causes this?
Am I going to need to beat it solo for it to count or what?