When I open both docs they appear to have the same content and the text appears in the same typeface. I don't see any strange typefaces in either doc and copy/pasting doesn't change this.

Perhaps there is an issue with a corrupted font on your machine. Are you able to reinstall the Aptos font? If you choose a different font for the content you just pasted, does it resolve the issue or does it persist?

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Andrew Lockton
Chrysalis Design, Melbourne Australia