this is the starting position:

this shows that from this orientation the up/down rotation is good:

but when I turn left (the ball is one of those four balls which I added for better orientation):

the up/down rotation looks like this:


this shows that from this orientation the up/down rotation is good:

but when I turn left (the ball is one of those four balls which I added for better orientation):

the up/down rotation looks like this:

