A strange issue happened:
I removed a product tag from every product that I have, but the page for it still exists. (/collections/decor/“tag-name”)
I want to have the tag completely removed and the page for it to not exist but cannot figure out how.
Any help?
Sorry you are facing this issue, it would be my pleasure to help you.
Welcome to the Shopify community! 
Thanks for your good question.
Please share your site URL,
I will check out the issue and provide you a solution here.
Hello @roboconnor ,
Can you please share your site URL, so that we can check out the issue and provide you with the best solution.
Also, please check this link to remove tags - https://help.shopify.com/en/manual/shopify-admin/productivity-tools/using-tags
Regards,
CedCommerce