at first: sorry for being late with this issue, just noticed it.
One of the new weapons adapters is connected to the wrong part and so it moves in the wrong direction when you change the stance.
The specific part is "anim_weaponmount_02_l". This part contains both weapons adapters but the right one needs to be merged into "anim_weaponmount_02_r"

Here you see it in Blender. The right adapter (left in the picture) is connected with the left weaponmount and because of that, it moves into the wrong direction.

I also noticed the turret hatches work a bit strange. The top one moves sideways through the hull:

The bottom one moves also a bit into the air, but its still ok i guess.
Those bugs are nothing gamebreaking, but it looks not very well so hopefully you can fix that in the future



