All dns records weren't found automatically

I recently added my domain to Cloudflare system but it didn’t find all of the DNS records.
I manually added three records. Actually it only found one TXT and I added other two. An A record and a CNAME.
Btw sometimes I refresh the site it says we got a 504 error. Is it related to those DNS records? I mean do I have to add them all to the system? Or it is related to sth else?
Please help me fix it

A 504 error isn’t caused by DNS:

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