Bugged crouch and jumping on one PC

[MarrowB83]

Operating system and version:
Windows 10 Pro, 20H2, 19042.746
JK version openjk-2021-02-15-d2ed03a0-windows.zip

Is this for single player or multiplayer?
Multiplayer game

Description of the bug (and if possible, steps to reproduce the bug):
My character is "bugged" in some way. Happens to me on one specific computer. I cant use high jump, I move really slowly and crouch ("C" button) is bugged. I tried almost everything to slove this. I would appreaciate help.

Stepts to reproduce:

1. Start game (openjk.x86.exe)
2. Play
3. Create game
4. Begin

Wierd thing is, that if i run "jamp.exe", crouch is not bugged.

Recorded (1st PC is working, 2nd is not)
https://drive.google.com/file/d/1LBn1Q4q8ZdjxIvu8XhTHc4vtMUufAfDV/view?usp=sharing

What did you expect to happen instead?
Not bugged crouching and jumping. :-D