Welcome on board!
As it was the first patrol of a career and I suspect you of having upgraded your boat (adding an emblem counts, too) or changed your crew before departure, a common glitch happened which even super-mods couldn't fix.
You should never change a thing on your U-boat before the first patrol or when finishing it, you should hit Escape when you're at least 25 km away from your home base and click on return to port instead of docking.
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