I believe the order is based on the number of observations in each taxon.
As an insect identifier, a similar thing irks me with “March Flies.” That is the primary common name for the family Bibionidae, but it’s also listed as an alternative name for the Horse and Deer Flies (Tabanidae). There are more horse flies on iNat than bibionids, so they appear first, too:
I think it would be best to prioritize the accepted scientific name over synonyms and the primary common name over alternatives. But that’s not currently how it works.