Problem with my games

Hello, all I know that from this title you are thinking it's about the latest additions being gone. I'm not lol, I had the game Destroy All Humans! under my tracked, now playing, and collection since I began here. And I went to look at my now playing and it wasn't there! So, I looked under the game itself and clicked "Add To Games" but it said it was already on my tracked, now playing, and collection but it doesn't exist anywehre! Can anyone help me?

Thanks sooooo much,

Hotjim129