Masterpiece MP-10 arm defect

I noticed recently that my MP-10 Optimus Prime has defect while trying to fix the windows not lining up. It turns out I have two inner left arms and doesn't push fully up. It looks like a simple fix as I just have to shave the arm down to let it lock into place. Has anyone else encountered this, or, not even noticed till right now? Also, does anyone have any information on making the chest line up properly?


I'm amazed it has taken me years to notice this.


I'm amazed it has taken me years to notice this.