Created attachment 352767 [details]
Screenshot

I get 2 cursors when the cursor is at the right of my rotated screen. One cursor is normal and one cursor is rotated and positioned where it would be if the screen was not rotated.

Here is a screenshot. I've artificially added the second cursor on the image where it is on my screen, because:
- Gnome-Shell's print screen doesn't draw the cursors, and
- GIMP's print screen only draws the "real" cursor.

I have:
- Gnome-Shell 3.25.2,
- Mutter 3.25.2, and
- Linux 4.11.3.