Is it the first patrol in a new career? If so, it seems you have struck an old bug.
If you do any changes, upgrades, to your boat before the first patrol this is often the result, sorry. Sometimes you get this zero renown thing after first patrol even without making any changes at all, inc. crew.
I always do a short sea trial of the first patrol in new careers, just go some 50km. out and then return to base. Then I do whatever changes I want before the second patrol.
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