I am writing an A4 PDF document. I rotated a diagram in the document 90 degrees. In order to see it better I used Okular menu to rotate the page 90 degrees in the reverse direction. What happened after this almost caused physical pain in my eyes. The text was very hard to read. I tried to rotate my head but this hasn't helped. I suspected that resolution of my monitor is wrong. Finally, I realized that the magnification has changed because my "Fit width" was first for the width of A4 page, but now it was its height. So I consider this as a bug that rotating page may change magnification. One reason for this be a bug is that it just hurts eyes. Reproducible: Always Expected Results: Rotating should NEVER change the magnification.
Sorry but it's not a bug, you had fit width, and then you rotated the document, fit width kept applying, if you didn't want fit width you should not have chosen it.