I don’t know if this is relevant, but on Cloudflare I have grassroots.land, outsourcedmath.com, ruppssites.com and wnymathguy.com. For some reason I put asterisk A records in the two %math% domains. Maybe because “O” comes before “R”, Google thinks something fishy is happening because of *.outsourcedmath.com having the same IP address as the other domains on that server?
The latest I found was that it stemmed from my hurried, thoughtless actions during virtual server creation. See Problems after using the Cloudflare API token for DNS - #8 by WNYmathGuy for the step I did wrong.