Last Lines on Facing Pages Do Not Line Up

I’m curious if anyone else has experienced this issue–and how to fix it. My Christie-themed PDF output looks so nice, except for the fact that every so often the last lines of two facing pages are jarringly out of alignment–one bottom margin considerably larger than the one on the other side (though all the margins are set to a uniform 2cm). I tried changing the line height, but that didn’t help. Any thoughts?

Sounds like an issue with ‘widows & orphans’: Widows and orphans - Wikipedia. You can try to tweak these values in your theme’s PDF settings: Widows, Orphans and Bottom Balancing – Pressbooks User Guide

I’ve tweaked the values for the Widows & Orphans. So much better! Thank you!!