Why is substance painter destroying my UV's on import?

I have no idea what's going on here. I'm trying to bake my high poly asset to my low poly asset, but I can't even get that far in the process. When I try to import my low poly, which comes from Maya with nice, clean, blank UV's, it just throws all this random crap on top of the UV, completely destroying it. I need to get this baked over ASAP for my assignment, which is due this weekend.