Purchased album removed from iTunes

Hello everyone, I am having an issue with iTunes. I had bought four Assassin's Creed albums in the past, AC II (2), AC Brotherhood, AC Revelations, AC III (3). Recently I noticed that the only album I have in my library now is Assassin's Creed III (3). I tried to downloading all missing purchases but iTunes said all purchased have already been downloaded. I checked the iTunes store and it shows the three missing albums as not purchased. I am frustrated that I might have to repurchase those albums because the first three were removed and re-listed. Example, on my iPod, which still luckily has those songs synced into its library, displays the name of the album as "Assassin's Creed 2 (Original Game Soundtrack)" but on the iTunes store it merely says "Assassin's Creed 2 Soundtrack". This indicates that those two albums, despite having the exact same data and description, they are two different albums according to iTunes. Any help? Otherwise that's $40 just to repurchase my albums that should have never been removed and re-listed to begin with. Also, no they were never purchased on a different iTunes account, so don't say that could be the cause.