Hi, here’s a recent topic about this that covers some of the common reasons: https://forum.inaturalist.org/t/people-identifying-sightings-identified-previously-when-it-is-unnecessary/76478
Because this was so recently discussed here on the forum I’ll set this one to close soon. I’d suggest reading through that one (there is an icon at the top to help narrow to top replies) and contributing there.
Click the little stack icon to view top replies.