Ok, update on the slopes glitch.
I noticed that when I loaded my Fort Wars save, it would bug out. So I disabled all add ons not used in that save file to narrow it down.
I would then disable an add on, and test, disable and test, ect. When I disabled the Military jeep, it stopped doing the glitch.
So i ran slopes with defaults and Military jeep, I spawned one, and nothing happened, but when i laoded my Fort Wars, it did the glitch
So it seems to be like a mix of my save and the military jeep..