Site not accessible from Serbia

I have problem with and I use Cloudflare service on these domains and since last night I can’t access them from my country (Serbia) or ISP provider (tried with Cable ISP and with mobile carrier) . I’m getting “Error 502 Bad gateway”. If I use VPN connection from another country I can access sites.

Can You please advise me what could be a problem and how to fix it?

Thanks in advance!!

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