Some breath marks not appearing

Some of the breath marks I’ve entered in a piece appear in the galley view but don’t appear in the page or print views. Other breath marks of the same type (commas) appear just fine. Is there anything obvious that might cause some breath marks to not appear?

There’s a little bug that prevents a caesura or breath mark that coincides with the end of the system from appearing. Try moving it a tiny bit rhythmically before the end of the system.