Hello,

I have duplicated the product with the problem and deleted all the description, then I added a few words and products tabs work correctly.

So you need to delete HTML description in the problem products cause this markup causes the problem. If you want to add size guide to the product please find here information how to do it correctly https://xtemos.com/docs/woodmart/faq-guides/create-size-guide-table/

Besides in product page, you can use WP Bakery Page Builder http://prntscr.com/jl6nk7 However, you need to delete this HTML markup.

Please delete the product duplicate which I have created, it was just to show you.

Best Regards