Hello,
I'm having an issue with the Spire.Doc where it appears to be writing characters on top of each other. As you can see in the three attachments:
In the rtf_view file, you can see that there is "<Words>[Space]<Colon>"
In the pdf_view, it appears the Words are laying on top of the colon.
I also added a screenshot of the RTF tag info in case that helps research what might be causing this.
Let me know if you need any more info, but I'm trying to debug this information for our customer.