Page numbers wrong in TOC

The attached .epub is automatically generated using pandoc.
https://github.com/greyscalepress/manifestos

On my Mac it is fine, using Calibre viewer, with the TOC items jumping to the correct chapter and page.

However, on my Sony Reader the page numbers listed next to items in the TOC are those for the following chapter. Tapping on an item in the TOC jumps me to the page number display, but that's the following chapter. Otherwise the epub opens and reads just fine.

I suspect there is a problem with the epub that is causing my Sony Reader to misbehave.

Any ideas why this might be? Thoughts appreciated.

Thanks!

Attached Thumbnails

   

Attached Files

Manifestos_for_the_Internet_Age-20211207_155816Z.epub (1.12 MB)