I think the original issue has arisen again in some form. I’m currently at this link, and observations with the same number of IDs are shown with a different number of IDs
both of these observations have an ID by the observer, and then a confirming ID by someone else, yet only the right hand one shows the tag + 1. I can’t perceive any difference between the two
https://www.inaturalist.org/observations/19630973
https://www.inaturalist.org/observations/19544500
not the only case either; many of the observations within this search have no label, but they do have an extra ID