Bartosz Drewniak

It’s true that when Faire plugin is active you encounter this bug although the issue you have is not exactly Faire fault. One of the values you entered is not correct. There is a field “Case quantity (Faire)” have html validation rules and minimum value is 1 and you probably entered 0.

When the “Inventory” tab is not selected this notification is not visible.
Most of the fields in this product form is not html validated but there are some. For example in “Advanced” tab “Menu order” it require step to be 1 so entering any fraction number (for example 0.1) will trigger html validation if you navigate to other tab you will be able to replicate exactly the same issue.