I use my scroll wheel to jump.

I've always done it. Recently I started using Arch Linux with KDE plasma and went for  a game of CS2 with my buddies

But I kept. Fuckin. Jumping. I jumped when I flicked, I jumped when I set my mouse down

It was awful, I even spoke to Logitech Support about it, they were obviously not much help.

I have a G502 Lightspeed, bit on the pricy side so I wasn't too thrilled about changing my mouse

I tested it on my windows 10 laptop and it worked fine, it didn't scroll when shaken.

I also tested it without the lightspeed dongle (Wired mode) and it didn't happen

So I installed a program called Solaar and set it up as follows:

Which did the trick. There must be ways to set up these quirks without this GUI software, using libinput (By setting the local-overrides.quirks file or something) but it works for me so I've stopped looking into it.

That's all. Good luck