Rehearsal marker position reset by *everything* in editstyle.ui
1) Open the attached score. Note the position of the A2 and A3 markers. They are horizontally shifted to the right of the default.
2) Open the edit styles dialog. Change any setting. Concert pitch is near the top of the first page of settings, that will do it. You don't even have to hit apply, you can see the rehearsal marks move in the background, behind the dialog box. If you click Cancel in the edit styles dialog, MuseScore thinks that no changes have been made, but the markers have been moved.