It's easy to see the problem with my example:

I have a geospatial index for the collection
'users'. From a Google Map (Javascript V3 API), I make calls to a node
js instance which does the MongoDB queries: who are within the box
limited by 2 lat,lng pairs (south west, north east)? The problem:
sometimes it returns the wrong number of users and it's so weird
because it happens moving the map JUST a little bit. No sense.

This is a js running the example:
http://pastie.org/1710646

It happens both w/ node native driver and shell.

Thanks in advance