AMP for WP not working

I set up the AMP for WP plugin and tested it for validation on https://search.google.com/test/amp. The result says, “Non-AMP submitted
This page isn’t an AMP. However, it references the following URL as its AMP version:
https://www.thedentalclinicthane.com/amp/”

Why is this happening and how can I amend this?

The page I need help with: [log in to see the link]