I'm using WordPress on my website. To add the AMP pages to my website I use the official WordPress AMP plugin and another plugin called "AMP for WP". I've been using it for 3 months now. Recently, I discovered a Non-AMP page while searching Google from Laptop (Not mobile device). I checked the page source and found that the rel-canonical tag is properly set to the non-AMP page. I don't know why it appeared in the desktop search.
To see the example google this "how to change Author box gravatar size" and you'll find the AMP page and the non-AMP page doesn't appear.
Where is the problem?!
Thanks in advance!