I suggest that a legend for the columns should be added somewhere on the page, to improve the usability.
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If you hover over the numbers, it summarizes at what each number represents. The left column is "total score", which is a value equal to upvotes - downvotes on all non-CW answers where upvotes > downvotes. The right column is "number of answers provided", which is the number of answers posted that qualify for your score; it shows how many non-CW questions have positive score.
A legend may help usability better, perhaps. All I know is that the hover is quite consistent with a fair amount of the rest of the numbers on the site. I've never been to that page before, so I just guessed to hover in order to figure what they were.