I really recommend that you go through the lesson again, from scratch. Do not use the Project File, but add the Nodes one by one, as per the video.
This is extremely hard to troubleshoot otherwise. (It looks like only one of the axes (gravity?) uses Delta Time…)
Other people have done this course without running into this issue, so I’m pretty sure you have made a mistake somewhere along the line (maybe even in an earlier lesson).
I have watched the whole course (some time ago) and didn’t find any mistakes, but I haven’t actually done this in Blender, so I might have missed something.
When I find the time, I will try this myself and see if I run into any issues.
