Hi!
It's not a bug. The number you see is the total you get when you pick that skill. So Linguistic 2 gives you +3 in total and Linguistic 3 gives you +6 in total.
It might be badly written. Using your way of thinking the numbers should have been +1, +2, and +3, where all numbers stack with each other. But not so in KBTL, the numbers do not stack.
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