521 error only for one domain from certain locations

I have 8 websites on 1 server, all configured the same but only 1 websites returned 521 error for some locations. For example Germany - 200, France - 521 (my local IP - 200 too). If it was server problem - I got errors for all websites, so I think maybe it is related to Cloudflare, but settings like the same. Maybe someone faced with this?

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