Hi ! Thanks for the answer.
Merging all vertices helped a little, I feel like it’s a bit more clean. However the area I showed in the screenshots is still a bit messy. clearly caused by the bevel modifier I think, when I activate / deactivate the realtime display in the viewport, I can see that the bevel is the problem. I wonder if maybe I accidentally applied the bevel weight to a vertex and / or an edge earlier in the process, and now that i’m trying to add weight again in this area it creates a problem.