I have a similar problem when searching for observations of Chrysomeloidea (specifically observations in the Eastern United States, as there are too many species observed worldwide to be able to see them all at once, but I imagine it’s not a locality related problem). There are at least 50 species, subgenus, or genus level taxa in Cerambycoidea (specifically Cerambycidae) that are shown along with all the observed taxa in Chrysomeloidea. When I click on the “1 observation” for, let’s say, subgenus Prionus (in Cerambycidae) it shows me all 3,832 observations of 4 species in that subgenus in the Eastern United States.
Should I post this separately as a bug report (or beetle report, haha), or flag any of the taxa, or do I not need to?