I recently discovered the Diagnostic Center, and it showed up three issues.
The issues were Nameservers, DNSSEC and DS record configuration. I am hosted with SiteGround, so it always refers me to go there. When I go to SiteGround, it says that the nameservers and DNS has been set up properly. I am also not getting any other errors or issues with cloudflare.
Should I ignore the errors in the diagnostic center?