I once had similar behavior with a title which seemingly at random after using the program for a while and doing stuff, placed itself at the top. I don't recall exactly how I solved it, but I think it was caused by some boxset weirdness. It might have been that the disc in my collection tab was a child of a boxset from  a different tab. So try going to the "All" tab, see if those are part of a boxset there, and then remove the boxset connection.