I have a desktop version of this website and a mobile version set up (using one Sparkle website page builder) and I believe it may have something to do with that?
Sparkle places the “canonical” address in the page, based on the “web address” field in the general section of the site settings. But you can’t have two canonical addresses, just one.
So my guess is in the google search console you entered www.adriantchaikovsky.com, and now google wants to find that as the canonical address.