I see the screenshots, but we do not know the reason of the problem.
Maybe the tab type items in your Trash (Prullenbak) folder cause the problem, however we have tested that tab types in trash folder are not displayed.
Please see the 3 deleted items in trash, or try to empty the items in trash.
If you switch OFF the “Use for all products” checkbox on the edit page of a specific custom tab type, and use the “Product Categories” metabox on the same edit page for selecting some product categories for this tab type, then this specific tab type can be used only in case of products that belong to the specified product category.
Please let us know if you find out the reason of the problem, if you have found an error occurring in certain circumstances, we can fix it, if we can reproduce these circumstances.