I encountered a bug where the mouse cursor was visible even after I exitted a menu. The cursor moved on the screen as I looked around with my character.
Or in other words, I had both the crosshair and the mouse cursor visible in the keep.
I did take a screenshot of the bug, but oddly enough, the cursor did not show up in the screen shot. The screenshot only showed my crosshair, but not the cursor.
I tried to open various menus and close them, but the cursor didn’t go away.