I've been being plagued by this bug since the release of Melee 3.0 phase one. Whenever I fire a gun with either auto or held triggers after swinging my melee weapon using my scroll wheel, instead of firing a single round, like it does when I already have my gun in hand, it continues to fire rounds until I click my scroll wheel again. I use the mouse wheel keybind to control my fire rate for things like popping open crates, security cameras, etc.
Steps to reproduce:
Bind "Mouse Wheel