Cleaner shrimp doesn't move from it's spot, even when offered food

[Kit with Cat]

Hi everyone,
Seeing a really strange behavior of my cleaner shrimp. He sits near my torch coral, with most of its legs right on top of it, and it hasn't moved off its perch there for 2 days. Occasionally, it fans all of its on its abdomen (?)....is this normal? I've had cleaner shrimps for a while and I've never seen any of them do this before. It thought it might be molting but they don't usually molt out in the open...anyone have any insights?
Thanks!