Could be that it is the highest for all sites of a single user?
For a time, I have been running two receivers side by side, so I could see how changes to the set up worked, practically doubling the number of a/c seen when added up.
Usually, I have been around 950, with 797 been the highest value with one receiver, in the stats page, however, it says:
Highest 30 Day Ranking: 536
Edit: Apart from that, its a pretty big change, wouldn’t be suprised if quite a few people will need some time to get used to it.