I have tested the setup in several versions, and I always get the same result:
Press play to see how the moving Sphere changes the Weight.
I have only a few wild guesses, which I don’t like to do, but I share one this time: (sorry if that is just a waste of time)
Could it be that the Clone “dots” and the Voronoi Fracture” Source dots might be confused?
If you could share a file (needs to be zipped, while the compressed file is not always passing the security test, sorry if that happens, then I can share an upload link.)
All the best