T-pose after changing profiles between SL and FG in MO2

[DaAce]

I've got two profiles that I'm actively using in SSE -- one with SexLab and one with FlowerGirls. Both run fine, but I'm finding something odd when switching between them.

 

If I don't run FNIS again every time I switch back and forth, all the characters T-pose.

 

I have separate FNIS Files mods for the two profiles, so they shouldn't be using the same files at any time. And FNIS is dumping the aa2 & PCEA2 pex files in the correct directory each time. (I have Generate FNIS set up to create files in mod rather than overwrite under Modify Executables in MO2.) But clearly something else is getting updated, or overwritten, when I launch the game. Anyone know what those other files might be, and if there's a way I can separate those by profile as well?

 

The two profiles shouldn't be affecting each other: they're using different body mods, entirely different animation schemes, and so on. But something is persistent, and I can't figure out what it is.

 

I can keep doing this every time I switch profiles: I'm not proud...or tired. But it feels like something that should be fixable, so I want to fix it.