It looks like something here is putting too many systems into the frame. What does the frame fullness indicator in the lower left corner of the page say?
If you haven’t manually added frame breaks or adjusted staff spacing, and if you don’t have casting off set to a particular number of systems per page then this may just be an instance of the circular trap that Dorico sometimes falls into.
If this is the case, then adding a manual frame break, probably on the last system, should free up space on the page to help resolve conflicts.