Weightmapping or maybe ERC Problem

weird-grafx

Hi, anyone here that has experiance in weightmapping and ERCs? I try to use G4 content on G8 and get results I can't explain.
What I've done:
1. Exported the Gen4 Parachute to Blender
2. Morphed the model to fit G8 and added some geometry (white in screenhot)
3. Exported form Blender in OBJ format
4. Imported in Daz
5. Applied Transform with G8

Basically it's working, but the new created geometry is moving when I move the for example the arms.
I removed all weightmapping form the new geometry but it's still affected. Can ERCs be the reason?

Arm moved

I welcome all suggestions