I see this on UL search:
I would like to know how is this sorted actually as the amount of "views" apparently doesn't mean that it's frequent.
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They are organized by amount of linked questions. The first and second questions in your screenshot has exactly 39 linked questions, the third has 37.
Apparently it doesn't count duplicates questions (which would be a killer feature) so, some questions that were commented or referenced plays in the sorting.