Hi,
Two plugins are required to show ADD TO LIST buttons:
1. plg_content_vm2wishlists: This one show the buttons on the product details page
2. plg_vmcustom_vm2wishlists: shows the buttons on the browse & category pages.
The 2nd one is a VM custom field, so it needs to be added as a custom field to your products. You can either add it manually to each product when creating new products or update the component anytime you wish the update script to automatically add this vmcustom field to products that don't already have it.
So reinstalling, updating the VM2wishlist component should solve your issue. (which is not related to columns).
Hope it helps. Let me know.
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