Actually it is not counted as a master's degree per say. Law falls under professional degrees, so even a bachelor's degree entitles you to same points as a master's degree.
I was actually surprised that architectural degree is not counted as professional, since the bachelor's degree is a 5 year course. So I am basically entitled to only bachelor degree points even though I have the same number of years or more than most people with a masters degree.
That's a tricky situation there. If I were you, I would follow the ECA. As that is the certificate relevant to Canada. But before I do so, I would contact WES and Ensure that them putting down your Year of completion as 2007 is not an oversight.