Issue with using the default woocommerce csv import

Hi,

I’m facing an issue, when i import products the custom attributes added in my csv are showing when i edit the product in the backend but dont show in the front end in the Specifications tab.
They only show when i edit the product and press update from inside the product otherwise if i do a bulk edit on all products and press update nothing happens even when i update a single product from the product listing.

When i export a product that is showing the specifications tab in the front end i can see this column exported: _specifications_display_attributes But when i import this column there is not a column to map it to.

Can someone please tell me where is the issue?