Amazon Look Inside books, some work, some don't.

I convert html to epub with Sigil.

The graphics are fine when viewing in a web browser, sigil, cloud reader, kindle previewer,
kindle online previewers etc.

In some ebooks the graphics work with 'Look Inside' and not with others,
even though the code is the same.

Gaps appear in the tables between the rows.

The diagram on the right is correct.

Anyone have any ideas?

Attached Thumbnails