Animation visual error

Hello everyone, i have imported a character which is the soldier from the maximo package.I have managed to attach the animations i need, but my problem is that in some of them like the idle position or the aiming my soldiers arm gets into his body so somehow i have to fix the model and the animation.I was trying to find a way but couldnt figure it out.Any advices?
Here is my screenshot with the problem i have.

Hi there, make sure you have all meshes and animations as fbx for unreal engine