I integrated accelerated mobile pages (AMP) on my site and it seems OK but I did notice something on the HTML Improvement. It seems that some of my pages that have AMP are considered to have duplicate title tags.I wonder if it is because I put in a rel=canonical containing the original link of the page? I can see it on both code of the original page and AMP page. What else could be the reason of the detection? I don't see any errors on the AMP Section in the Search Console for the AMP pages.
HTML improvement detection of duplicate page titles on AMP
google search console;duplicate content;amp