Product Category selection box for selection not displaying

[Alkhamsa]

Joomla V3.10
VirtueMart 4.0.6 10690
PHP version: 7.4.33

When I click on a product to change its category the category box briefly flashes and then disappears.

I had posted this in the Admin but it seems this might be the better place for this question.

[GJC Web Design]

sounds like a problem with JS Chosen .. you need to check your source code/console