We need more information about your problem, to have a better picture of this problem. SO I'm afraid that you're experiencing this known bug:
But actually this bug just happens when Export HTML.
Also check, if the page tile contains ampersands, if so it could be related to this bug:
or this one:
Hi team, I’m Avinoam, a product manager on Confluence Cloud, and today I’m really excited to let the Community know that all customers can now try out the new editing experience and see some of the ...
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