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Because of number of letters.
If you just sum ASCII numbers for each letter in a word "aa", you'll get "97 + 97" = "194", in the same time for word "w" you'll get "119", i.e. "194" > "119".
It's a wrong answer.
According to the task, you should consider letters position in the alphabet: a = 1, b = 2, c = 3 etc. : so you supposed to get for "aa" -> "1 + 1" ="2", and for "w" -> "23".
"23" > "2". The correct answer is "w".