CloudFlare add some unexistings subdomains

While I’am adding new website, Cloudflare shows me a lot of unexisisting subdomains. Why it happens?

This is probably because there was a wildcard DNS entry, which means when Cloudflare scanned for DNS records it picked up on all of them
See

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Thanks! It’s exactly what happend. Recently I replaced CNAME wildcard with direct domains.

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