Scattered mesh

Does anybody know how to fix a scattered mesh while importing animations from 3dsMAX 2016? I’m only having this problem with this rig that I customized a bit to suit my needs a little better. Other than scaling and rotating it so that when I reimport to UE4 it’s the correct size and orientation, it’s the default FPS Tutorial rig. Here’s a picture of the problem and of the rig with no animation applied. The animations look fine in MAX, but look like a kid that held onto a quarter stick of dynamite too long when I preview them in UE4. Any help would be much appreciated, thanks!