Any blender expert??

I cant reallly tell what "this" is exactly but if you just imported the model from like models resource or something similar the weight painting doesnt always transfer between different programs, meaning the bones of the rig/skeleton tied to the mesh arent tied to the right parts.... meaning you gotta paint those weights yourself. its a bit of a pain but thats just how 3d programs are ¯\_(ツ)_/¯