Yeah, it is wrong, but if you go into perspective mode there is no problem extruding along X. It seems that it happens to the vertices that are in line with the Global X=0, but as soon as you extrude on X it can be switched back to Orthographic and the extrusion goes back to working as, I think, it should.
I didn’t play around to find the limitations (eg. do other vertices on global X=0 have the same issue? or, if I extrude and right click can I grab and move along X or is it still locked to Y and Z only?) but I’ll keep testing it once I get through all the courses I’m doing.
This wasn’t mentioned in the video, btw. I have no idea why this is happening because no one can explain even what it could be that’s causing it… Are there preferences that can affect this? Has anyone else had this problem?