[PDF] Upper line overlaps body text

Hi,
First of all thank you very much for the book!
The problem I encountered: The upper line of each page overlaps the body text in PDF version (release 239468e).

<img width="1109" height="345" alt="Image" src="https://github.com/user-attachments/assets/72425c07-a987-4792-853d-6bdac4364ae1" />

Thanks!