I never noticed this until now. See, before I had a smaller harddrive and I would delete older XBLA games that were taking up too much space, since I can just redownload them under my account. For some reason, stuff I transferred to the 120 GB drive did not go through, meaning that the system is asking me to purchase older games I already bought on my older harddrive. How did this happen? Is there something I can do?

Is this on the same console & account that they were originally purchased on?

Yes....oh wait...it's a different console since my old console got the RRoD...hm...I guess that's the reason some of the games are gone. It's the same account though. :(