Web. Chrome. Happens with API1 and 2.
Go to https://www.inaturalist.org/taxa/352671-Tilletia
It lists that many species have some observations.
Click on one e.g. https://www.inaturalist.org/taxa/384516-Tilletia-caries (this one shows 7 observations) but there are none when you go to the page for that species.
Explore also shows that there are no observations https://www.inaturalist.org/observations?place_id=any&subview=map&taxon_id=384516
So it must be that the genus page is accessing some bad index data which is saying there are species when there are infact none. The same bug happens for most species on that page which have observations.
I noticed this on a plant the other day too and didn’t think much of it, but it may be somewhat widespread across the site.