this is an ancient stock bug as old as the hills...
did you return to base by driving your sub back to the dock?
or
did you make ANY changes to your boat prior to the first patrol of this career?
if you did either of those things it can result in loss of all credit for any sinkings or downed aircraft on that patrol. however it should only do this on your first patrol.
DO NOT make changes to your boat prior to completing at least one patrol... that is usually why this happens.
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