Most of you know this already but Google's domain diversity doesn't have a feature that says a URL or site can only show on the first page of Google X number of times. Google's John Mueller confirmed that on Twitter last night after being presented with an example that has a single site showing up several times for a query on the first page.
John Mueller wrote "there's no hard limit on the number of times a site can appear in a search results page set."
@SethNickerson There's no hard limit on # of times a site can appear in a search results page set.
— John ☆.o(≧▽≦)o.☆ (@JohnMu) May 23, 2017
Some queries, espesially the more long tail and unique, can show a site multiple times on the first page of the Google results.
Google has tweaked their domain diversity sets over the years dozens of times. There is no perfect solution.
Forum discussion at Twitter.
