There is obviously a big issue on ahrefs where the DR from a domain is (almost always) automatically forwarded to all their subdomains (without any reason).
If you not familiar with this bug, check out on ahrefs and compare their DR with all their subdomains: f.e.:
Their are all magically getting the "worth" of the the main domain "".
And with this in mind, i could technically abuse this fact by getting many backlinks from some jimdo subdomains and my DR would go through the roof.
Obviously you cannot trick google with that, but you can trick ahrefs users, who just try to get a good feeling on how strong a website is.
This NEEDS to get fixed in the future, otherwise, "Ahrefs Domain Raiting" Metric is not as trustworthy as many of us think.