It's a bug. Here's a tip: Before you dock at port, or return to base if you don't like to actually travel to your base, SAVE your game one last time. If you get in base and ever spot you are only getting 0 renown and/or it's not showing that you sunk anything, reload your save, and return to base again.
It happened to me once, and I've always made a save before docking at my port, so it saved my butt. It's a buglet of some kind. I've returned to base on occasion with half a load of torps due to an odd slowdown that seems to happen to me on occasion if I spend too much time in the English Channel, and I've never been harassed or had my renown ripped off for it. (In fact, I got promoted to Lt. Commander last time I rtb'd due to that odd slowdown).
So you won't get penalized. You can check this by returning to base anytime after making even 1 kill, (or heck, zero kills but do your 24 hour patrol, you'll get your renown).
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Idaho-
-I like to play poker with Tarot cards. The other night I got a full house, and 4 people died.
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