My only other guess (Be it crazy) would be that if you're on a laptop, maybe your spacebar/touch pad is faulty and pressing space moves the mouse? :confused:
I got no others idea, sorry.
Maybe @Puppytine can give you his two cents
I have never heard of this before. By forward jumping action you mean just holding down jump, right? Maybe you somehow have your jump key bound to look up?
It might be possible if you construct a .pk3 of an existing base/lugormod map. You could try creating a server and switching the map to the base map name, never tried that. (Though most likely not possible).
Just enjoy um_bespin.