Google’s Gary Illyes reminded webmasters on Twitter that they should check the URLs that they use in canonical tags on their web pages.
Hey. HEY!! If you like rel=canonical, could you maybe check what are you putting in it? Please? {{configCtrl.info .canonicalUrl}} is probably not what you want in it. pic.twitter.com/10PTRaHbCV
— Gary "鯨理" Illyes (@methode) September 4, 2019
Check your canonial tags now
The website audit tool in SEOprofiler checks the canonical tags on your web pages (and many other things):