Astronaut spinning around in first person view

Trying to move forward or backwards while in first person causes weird glitching / spinning or walking in circles. Observed after disembarking from a seat. Video to follow soon.
Edit: I recorded the bug so it's more clear to see what I mean. Please note that I only used the W and S keys, I didn't cause the weird sideways glitching myself.
https://youtu.be/dbmrrKjxqP4
While recording I also noticed that although I have a slider for forward motion on screen it doesn't show any movement when I press W or S. Moving the slider doesn't do anything.