My guess is you started the shooting war a month early based on the info you've given. If it was your first patrol in a career starting in 1939 without using SH3Commander then your patrol would have started on 1 August 1939 not 1 September 1939. Therefore your actual date of the kill would most likely have been 05/08/1939 at a time when Britain and Germany are still not at war. Any kills made against "neutral" shipping result in negative renown.
You cannot attack British shipping unless it's harbours are red.
You can either spend some time doing a shake down cruise, return to base and start your next patrol early enough to get on station before the shooting war starts, or use SH3Commander to select the start month of your career before starting the game.
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