My parts lose all formatting when exported

Whenever I export scores with multiple parts (for whatever reason, this problem doesn't occur when there is only one part in the score), it doesn't matter how I format each individual part, the pdfs end up formatted completely different to how I made them. It's as if the parts aren't extracting or something like that, but I am not aware of a way to extract individual parts on Musescore 4 (if there is a way). I've attached screenshots and files to show what I mean. This happens every time without fail, and I've tried virtually everything I could, just trying to export one part, the whole score, exporting them all together or separately, it is always the same outcome (and yes I saved the parts before exporting, many times). Strangely enough, the main score itself maintains good formatting but the rest of the individual parts don't. I would really appreciate some help with this.

Refer to Musescore issue.png to see an example of what it looks like in the score
Refer to Birdman-Score_and_Parts.pdf to see the same piano chart after I exported it (along with the other charts and the main score which retained formatting)