Display in browser offsets the page

I noticed a new bug appearing on the Musecor.com webpage: In playback of a score in Safari (version 16.3), there is a slight vertical off-set each time a new page is displayed, displaying the page a little lower. After 20 some pages, this becomes so bad that part of the page is no longer visible. Manually trying to rectify it does not work, as it jumps back on the page position at the next page.

Here is a score for which this happens (https://musescore.com/user/54471/scores/11202547), but it is not the only one. I tried some older scores where this behavior was not showing before, but now it does. The only other browser in which I tested the phenomenon is Brave, where the same thing happens. I don't know whether it is something embedded in the MU4 file?