Products not visible in backend, products lose their category

[Kuubs]

I have some weird issues in the backend of my Virtuemart. Version VirtueMart 3.8.2 10325 and Joomla version 3.9.18. When I first open my products not all the products are visible, only when I browse to categories and press on "Show" the products show in the products section. Also sometimes the categories are not visible in the dropdown of the products screen.

And when I open a product it automatically removes the category from the product. Quite annoying to say at the least. Someone knows what is wrong? Is there somethign weird going on with my installation? How can i Fix this?

[AH]

possible ajax error on product load - use the console to check

[Kuubs]

possible ajax error on product load - use the console to check

I have indeed a javascript error from bootstrap tooltip extended. TypeError: Cannot read property 'VERSION' of undefined. How can I fix this?

[GJC Web Design]

maybe something here helps

https://forum.virtuemart.net/index.php?topic=139303.msg489367#msg489367

[Milbo]

btw, it does not remove the categories, they are just not shown and when you store, the product should just keep the categories. When the category load failed, vm gets the info about that.