a few windows in our log house seem to be tilting in. when you look from the side angle they are really leaning in. We bought the house from owners who had it built from a kitabout 20 years ago. The house does have screw jacks.
Probably a little late for the screw jacks if it is 20+ years old. You will have to remove the windows and re-set them square. They probably didn’t leave enough settling space above them.