I'm an android user as well (both tablet and phone) so its a strong possibilty - but I've never done any Android dev work so it may be a while!
When you zoom out, if all the places were shown the map would be really cluttered and unreadable (theres about 25,000 places in the map!), the numbers are "clusters" and indicate how many places are hiding under the cluster, which get shown as you zoom back down/in.
Whoops, forgot to upload it again after the upgrade!
Try again later and it should work.
See what I can do.