Compressed page?

A curious thing happens when I try to delete any of the expression markings at m. 42. I have attached a “before” and an “after” screenshot.
Maybe there is something attached to these markings that I cannot figure out, and I would appreciate any advice you have that can get me out of this. Thanks!

On a copy of your file, try deleting all the system breaks on the offending page and reassigning them.
(If you have any Frame breaks with their signposts hidden, show those and make sure your “wait for next frame break” are set properly.)

Or perhaps try this: in your system breaks, go to the Properties panel (command-8) and uncheck “Wait for next system break.” That might fix it.

Thank you! It got fixed!