Hi, I'm new to the tool but really liking what I'm seeing.

I hope someone can help me with this. I was looking for low roundtrip fares between Orlando (MCO) and London (LHR) for the dates April 22nd to April 29th being the return. I entered this in using Sabre DotRes and got the following:

Continental - $398 on fare basis LKWNC42S

Well, I went to the continental website and entered the dates but did not get that same fare. Am I doing something wrong here? I tried to follow the fare rules and work with that, but to no luck. Please advise so I know what I'm doing and what I can do to rectify.