The Sheldonbrown calculator is accurate, you can trust it. Highly likely, the bike's specs are wrong somewhere.
Hmm... I just found a review that lists the stock cassette at 11-25. With the stock 56/46 chainrings, if the Sheldonbrown calculator is correct, the stock gear-inch range is 34.4 - 95.1. That seems like a small range for an 18-gear bike. Wonder where they got the 26-95 range in the specs. I'm still a little dubious. I'll play with the numbers some more. Thanks.