If you've updated the table plus add-on post upgrade, have you tried rerunning the wiki markup migration tool?
If that doesn't work, and you can actually copy out the wiki markup of the tables, what happens if you then (in edit mode) click Insert > wiki markup and paste the table contents into the wiki markup box. When you click insert it should convert the markup on the fly. Then you should have your table in xhtml format in the text editor.
Hope this helps!
Hi team, I’m Avinoam, a product manager on Confluence Cloud, and today I’m really excited to let the Community know that all customers can now try out the new editing experience and see some of the ...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs