I assume that you didn't get the "She is going down" message.
How far were you from the convoy when the ships sunk?
Depending on the range of your atmoshere 8 - 16 - 20 Kms , if you are far from the initial attack place you may not be credited with the kill.
OR, you might be that unlucky that you damaged the ships so badly but the final blow was given by nature (heavy seas , winds) and again no renown is given to you.
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