As noted above, it isn’t possible to explain this in detail or determine whether there is a bug without more information, including the specific ways that a user accessed these counts. Links and screenshots will be needed. These stats are reported differently by different parts of iNat, whether browser vs app is used etc. There are a lot of threads on the forum about this you can read, some examples:
https://forum.inaturalist.org/t/species-counts-on-mobile-app-android-and-website-are-different/14464
https://forum.inaturalist.org/t/observer-species-count-does-not-match-project-species-count-in-single-observer-project/17518
2 Likes