From time to time message: "Your browser is out of date. Try opening the site in another one"

Hello! From time to time, people visiting my sites encounter the problem that the page does not load and the message “Your browser is out of date. Try opening the site in another one” is displayed. This happens both on a computer and a smartphone. After clearing the cache, everything works. Do not tell me what could be the problem? Maybe I need to make some settings on Cloudflare? The problem is not constant and obviously it’s not in the browser …

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