Wrong category parents menu

Hi,

I am managing an online e-commerce site and I have a problem with adding categories to the menu. I see the menu “product categories” and all categories seems to be there, but some of them are not under the right parent category. For example, under “Foo” there should be “bar1”, “bar2”, “bar3”, “bar4”, but there’s only “bar1” and “bar2” and the two others subcategory are at the end of the list…

I tried disabling and reenabling woocommerce without any success.

If you have any ideas please share.