Anyone know what is causing this retarget issue?

Does anyone know how to fix this or what could be causing this?

Are you autoretargeting?

No, I did this all manually i believe

Then you need to find the bone that is responsible for these straps, and try to retarget it with some of the bones you have on the original Skeletal Mesh, maybe with Spine_02 or smth

That’s the thing… Even if I clear all of the mappings for the bones the stretching still happens.

I’m not talking about clearing it, I’m talking about throwing it under some bone in Source Chain

Its also possible that the mesh verts are not weight painted to anything at all…