Measure keeps widening automatically whenever I do anything with it

In measure 374 of the attached score, whenever I do anything like adding a note, removing a note, editing something like a slur or accent, the measure gets wider. Trying to fix the width manually just makes it even wider, no matter whether or not I made the width value lower or higher. The version attached is right before the issue started, so it should be reproducible if you were to do something like trying to add a note in that measure, and this just started happening as I post this

Edit: Also, trying to reset page settings to default makes the vertical space huge for some reason