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Omg, you're right, they did it to me as well.

I had this issue years ago, and even got into a Twitter argument with their founder. It was a bug. Not sure what is the cause now.

In my case, it must have been intentional. The editor added a line 'Also published here' with the canonical at the bottom of the article.

Reach out here - that should not have happened. (that's what they told me)