Not in this bid but from a previous bid, I was called in to interview. For me, it was because a previous employer had reported I was not eligible for rehire, so I was called in to explain the situation and my side. Nobody else in my class had to do an interview. Ended up being no big deal but it was nerve wracking. Just told them what I knew and got no further questions!
As he said, everyone gets the investigation, if you got an interview it’s probably just to verify something that flagged on your eQIP for whatever reason!