Hi,
I was about to say it could be residual ooze, but hearing in your video that the extruder is working...

Just out of curiosity, what speed have you set ? Try reducing to 30mm/s for starters.

Have you put in your slicer a height max (stop printing over this height) ?

Do you have an end code (like go to X0,Y0) ?

If the motors are hot and it is none of the above, it might be board or motor issue.