Old tags still showing?

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Hi, I'm in the process of modifying the debut theme to suit my site. I'd like to add the 'filter by' dropdown to my collection and product pages so updated all my product tags with correct data. After switching on the menu item the dropdown is populated with the old tags. This only occurs on the /collections/all page, not the specific collection pages.

I've cleared cache, cookies and waited over 24h hoping the list would correct itself, however it seems stuck on the old data. I've also double checked the product certainly do not contain the old tags.