There seems to be some kind of script that turns on when the avatar becomes active in game that causes the legs to misaligned.
In editor
Vs in game

Not sure how to fix or edit this.
it deals with how the avatar is read with how the rig is setup, vrc has default proxy animations that are read to put in position where it thinks things should be by default with how the humanoid rig is. one of the common problems with this is it doesn't do the best job with digitigrade rigs. overriding proxies are a shot in the dark if they work or not with unity being finnicky at times
if debugging the thing to look for is an animation with the name idle or stance, i have to find a better way in overriding them at times
what is playing right now is an animation loop of idle stand which usually is desktop vr
the script that usually pops up when in game mode is vrcfury unless talking about something else
in general though ill keep that on the list for the next big update