In the edit window on Mac, the pano rotation did not work on a bracketed panoâ€¦ minus 90° or plus 90° made a 180° rotationâ€¦
Other users tests would help to confirmâ€¦
I have screen shots to show the bug
Look at the black dot on the boulder in the center of your image. It looks to me like it moved 90". Also, the rocks on the sides look different. I suspect the rotation may have been 90 degrees.
I think you need to move the centerpoint to be halfway between the center and left or right side of the monitor.