503 Error When A Record is Proxied

Hey,
The DNS is fully propagated. Whenever I proxy the A record to my IP I get the error 503. No other website has this issue. I thought that 503 error was caused by the hosting company but they kept saying that they have seen traces of Shopify and I should contact them. The domain has not been connected to Shopify for over two months right now. The DNS records are fully forwarded to my server IP, and I am using Cloudflare nameservers. What might cause that? For the sake of the website, I am keeping the proxy of A record “DNS only” for it to work. So you would probably be able to access the website without an issue.
Website name: skalcollective(regular com)

Thank you!

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