CNAME/A Record for Subdomain Resolving to Unknown IP

Hi, I am not sure what is causing this. Everything was setup and working for months now, but all the sudden when I go to my subdomain, I get a Error Code 526 Invalid SSL certificate.

Bluehost has a valid certificate, however when I go to SSL/TLS status, for my subdomain it shows error "The domain support.mydomain.com resolved to an IP address 104.21.xx.xxx that does not exist on this server". This IP seems to be Cloudflare's.

I have an A record pointing to bluehost's server IP. Why is it resolving to Cloudflare's IP? It was working fine for months up until now.
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