Attached is the results i get after importing an fbx export out of CC3 using UE4 settings and the default motion file that exports with it. Whats going on with the arms and how to fix it? I thought it was my personal mocap files that was causing this but it's coming right from CC3. Latest version of CC3 and 4.25

I have some arm twist as well after UE4 import , not as bad as yours , but still there. Any know any fixes? Did you check the box "use T0 as ref pose"?

Thats what i did and it cleaned it completely for me.