Just a thought - are you sure that you've gone back to your home port, as your "Home Port" will and does change without warning.
Look on your map and see/find the small icon with a sub on it- you may well have sailed out from Kiel but you may find that your home port on return is now, for example, Wilhelmshaven...
Apologies if you realise this already!
EDIT** Beaten to it!!!
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