Woocommerce Categories Missing & Keep disaappearing

Hi. I have built a site all ready for publishing and then pointed it to the root directory to be ready. After a few teething problems, there is one issue left being my categories partially missing. The Admin side panel to edit/add (Products>categories) them is empty but the products listed are in ‘categories’ and also the previewed website also shows the widgets and my menus work fine.

When I go an add a category it disappears after refreshing the Products>categories page.

I rooted the site by editing the index.php to point to the subdirectory. So all core files are still in the subdirectory. The ‘Site Address (URL)’ in Settings>General is set to the root and ‘WordPress Address (URL)’ to the sub.

Tried moving all core files but changing the folder names caused so many issues!
Hope you can help.