Strucutured Data Error

That's strange. Can you try running one of those posts through this tool?: https://search.google.com/structured-data/testing-tool/u/0/

Do they have valid updated, entry-title and author elements?

Seem that everything is ok

https://search.google.com/structured-data/testing-tool/u/0/?url=https://pawpawlover.com/dry-shampoo-for-dogs/#url=https%3A%2F%2Fpawpawlover.com%2Fdry-shampoo-for-dogs%2F

I've add these code in this discussion with style="display:none" a few day ago

https://generatepress.com/forums/topic/structured-data-errors-showing-in-google-search-console-webmaster-tools/

You shouldn't need to do that. He was added those elements in manually, whereas the theme adds them in automatically.

All of the structured data looks correct to me, and your rich snippet test looks perfect.