VAMP - Sometimes it works, sometimes it doesn'T


A Quick question: I want to use VAMP to apply some joint weigths from one mesh to another.
Both meshes are close and similar and I ant to use “closest point”. But somehow it works sometimes (in different scenes) and sometimes it doesn’t.

Only “normal projection” seems to work… I tried all combinations already and also shifted the object around ion the hirachy… any ideas/help?