[API-users] explanation for unlikely interpretations?

When viewing many (most?) of the iNat records on GBIF, I see a yellow box at the top of the page listing some "Interpretation Issues." Some of them I understand, like derived country, since iNat doesn't report the country, just the coordinates, but the following are more opaque:

* Recorded date unlikely * Modified date unlikely * Identified date unlikely

Here's an example: http://www.gbif.org/occurrence/923925309. As far as I know, all three dates are accurate for that record. Why does GBIF think they're "unlikely"?

I suppose this is only tangentially related to the API, so if I should be directing this elsewhere please let me know.

-ken-ichi