Sync Issues

Ok this may have been covered before but my attempts to search it suck...(or maybe it's just me)

I have 2 macs a mac pro and a mac book pro. my phone is synced with the MP but I recently noticed that my paid apps are not there under my itunes account. The apps section is greyed out because I dont have "SYNC APPS" selected. I'm not worried about losing what I have, it's more the paid apps aren't showing up anymore and I don't want to lose them.

Any ideas on this? You would think your apple id would match and automatically match your purchases with your device. Thanks for the help!