Issue with flying/swimming can't go up or down only left and right. Running HKN scrip!

[Wubsie]

I believe the issue is that your Space-key is under Hotkeys, and not under Movement Keys. The difference between them is that Movement Keys keep track of whether or not (and for how long) a key is kept pressed to enable movement for that period of time, where as normal Hotkeys basically act as if you simply tapped the key quickly, no matter how long you keep it pressed.