No idea how to explain this properly, but here's the problem anyway:

When I went to make holdtypes for weapons I made, with animations made for 2-handed weapons such as shotgun, smg, ar2, etc. etc., the left arm then becomes locked, so I can't edit Any of the left arm bones angles, and, if you move any right arm bones, the left arm goes along with the right arm.

I already tried fixing by switching to passive stance, and back again to former stance, but nope, didn't do the trick.

Idk if there is an actual fix for this, so I'll just have to rely on what I have for now :/