Thank you very much for your reports, and I am very sorry about the issue!
This has been confirmed as a new regression bug in Archicad 25 (registered as DEF-5748). The issue happens when you export/publish/print to PDF or other formats, but on the layout itself it does not show any issue. At the moment, unfortunately, there is no workaround for this bug yet. I can only suggest using the default titles until the bug gets fixed.
I am very sorry for the inconvenience! Feel free to let me know if you have any further questions, and thank you very much for your understanding!