Skeletal mesh bone sync

Hi everyone.
I’ve recently encountered a rather weird issue with a skinned model.
I’ve been using this script to sync some clothes on a rigged model and the sync works fine. However, when I try to add several other models from code in the hierarchy of the animated model, the children are always offset like the animation (just for them) has a delay.

Any recommendations on how to properly add children to a skinned model, after I’ve added the above “wearable” script? I’ve tried with add child, insert child (0/1) they have the same effect.

Unfortunatelly, the project is private