@Weston Braun Yeah this is the bandgap output. Not very good I know, but seeing things like this happen makes me think I can never get it anywhere near good.
To get good matching you need more than just fingers, the devices need to be split into a centroid layout and maybe with opposing current flow AFAIK. But that may be old info, I don't know about newer processes.
Anyway, I'm nowhere near the point where I worry about layout, I just want a fricking simulation to work well and I can't even get to that point so...