Hello, i dont know if its the good place for this little issue but im here '^'

I dont know why my weapon camo have this issue, my friend doesn't have this issue even with the same weapon camo, i tried to change my appearance but it doesn't work

I even tried to take data appereance of my friend and it doesn't work too :v so i dont have idea what i can do for it :c

My hand (and my shoulder) dont want to fit with this weapon xD but my friend hand want :c Katana and rod with this camo work good, only rifle have this

Thanks for reading me and hope you can help me ^^' (sorry for my bad english :c)