Compile for ePub formatting errors

Trying to compile my novel into an eBook has resulted in some interesting errors. The book looks fabulous, but chapters 5, 12, 27, 29, and 44 show up with a different font when viewed on my iPad. Does anybody know how something like this could happen, or a way to get around it? I’ve tried several things and got three of the five chapters to look right, only for them to return to their wonky look the next time I tried it. Any and all help is appreciated. Thanks.

The root issue is slightly different, but I just gave some advice to another user that should help you out, here: