Wrong Songs coming up when selecting via Artists

Hi there, I’ve started having a really weird problem with DJay that occurred during a gig last night that caused a lot of hassle. I’m finding that, when I select an Artist, it’s showing me wrong songs that aren’t by that artist at all. So, for example, right now, if I want to play “Happy Hour” by The Housemartins, I’m selecting the band, but it’s only showing one song by them which is “Poison Arrow”. That’s actually by ABC though. The only way I can locate "Happy Hour"is to look it up via Song Titles. It then plays fine…?

I’ve got DJay2 as well and that’s working perfectly fine and doesn’t have this issue at all.

Any idea what on earth is wrong with it?