Could be an old cached page. I sometimes get it if I click the red notifications bell on a page that's been open in a browser for ages and and is now out of date.
Happens on my iPhone 12 too. As above, refreshing the page fixes it. I wonder if it's something to do with changing from 5G to WiFi or back, and an associated shift in IP address?
I get it on Android too. Usually when I returning to the site that has been open for some time. I assumed it happens because I have accessed the site on a different device in the meantime.
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