I think this is the case. If you Agree with a new ID after you already had an ID, then it’s counted as withdrawing. I think the answer is at the bottom of this post:
https://forum.inaturalist.org/t/observations-identifiers-count-discrepancies/17880/5
Also reported here:
https://forum.inaturalist.org/t/differences-in-id-stats-counts-between-pages/29299
https://forum.inaturalist.org/t/identifications-count-is-different-from-my-profile-and-when-you-click-identifications/23000
https://forum.inaturalist.org/t/number-of-identifications-displaying-on-profile-page/17227
https://forum.inaturalist.org/t/how-many-identifications-have-i-done/18875
Some other thoughts here:
https://forum.inaturalist.org/t/what-counts-towards-a-persons-identification-counts/4165