Datasets listed from /regions linkout has extra datasets

[mduong7]

Mismatch from expected species list and datasets list. For example, no fishes in Adamawa range, but IUCN fishes showing in /datasets. Driven by geohashes.

[julieannhart]

This is probably related to database issues 806, 808, and 809. Hopefully would be resolved by remaking the summary tables, but we should figure out exactly what is causing the problem to make sure.