My mouse has a pretty sensitive wheel which is constantly making me switch weapons against my wishes during combat. When I do want to switch weapons, it always double-inputs and skips back to the original weapon rendering my mouse wheel useless.
I think mouse wheel sensitivity should be in the keyboard/mouse settings so we can adjust how sensitive weapon swaps are without having to drop the use of mouse wheel entirely.
I had the same problem. I had to switch it to a key because switching weapons was a pain