Final measures move to extra page

I'm working on editing the orchestral score for an opera, and have found a glitch in the formatting. On some of the parts, the last few measures move to another page as if there is a page break before them, which there definitely isn't. If I format the rest of the part to fill that last page, the measures move to another extra page instead. Any clue why this is happening?

p.s.
Ignore the part names being listed as bassoon on every page but the first. I know it's wrong, I just haven't got around to fixing it.