Doom 64 EX issue... Mouse related...

Hello everyone. I have recently installed Doom 64 EX, but whenever I use the mouse to look around, it immediately jerks back to the center once I have stopped moving it. As you might assume, this is highly annoying. Can anyone shed some insight on how I might fix this issue?

Haven't heard of that one. Personally I get a different kind of jerkiness. For me, it randomly decides to "skip" the mouse movements and I have to either wait it out or press escape and go back to make it stop. Really strange but this one sound stranger. Do you have anything else plugged in like a controller? Just a shot in the dark.

No I don't @Nevander. Sadly, I have nothing else.

I'm getting this issue too, same with Half-Life Opposing Force, they both used to work until now.

UPDATE: It looks like this,

Found fix thanks to Varg Anfall on YT: https://www.tapatalk.com/groups/doom64ex/doom-64-ex-mouse-not-working-t219.html?sid=d173a9fd7f00a641098335e71cb5daa6#p40003790