Road bike fitting: Fit calculator results look slightly different with the bike I am planning to purchase
The frame you are planning to purchase has a sloping top tube. This means that the seat tube is shorter than what it would be if the top tube was horizontal, and you simply use longer seat post to compensate. 

On the other hand, the results from Competitive Cyclist calculator does not have any numbers for stack, or height measured from bottom bracket to top of headset. With horizontal top tube this is not a issue, because it is directly related to seat tube length, but with sloping top tube you have to calculate it from bottom bracket drop and head tube length. Since the fit calculator recommends an unusually tall frame, the head tube is probably fine, and if the handlebars are too low for you, it is easier to raise than to lower them.