Sorry, I realized that my suggestion was wrong–I see in your first video now that the red LED isn’t on there. So my suggestion of current limits is likely not the issue.
I haven’t encountered this type of behaviour myself, so I don’t have suggestions for solving this. The only other possibility I can think of are the motor phase wires–if you swap two of the motor wire connections, do you get the same behaviour?:
Sorry about that. I’m hoping that someone else could give additional suggestions.
Best,
Yuni