I see the two stations, and I've seen your webpage. The other (MC9811) looks like an airport or something. It's not rapidfire and it's listed as APRSWXNET. It's 1 to 2 degrees different.
http://www.wunderground.com/weatherstation/WXDailyHistory.asp?ID=MC9811I donno. You should email WU.
When I first started, I had 4 stations listed before I got it the way I wanted it. I sure wish there was a delete button besides the add and edit buttons. The edit function seems to lock up a lot, too.
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Anyways, I emailed them and they fixed it so that now I only have two stations (because I have two stations).

Hope this helps.
If it went smooth all the time, it wouldn't be any fun!