If you have docked at port after your base has been changed, which I suspect is what has happened, take a note of your last save point before that patrol.
I personally have experienced a bug where you get constant 'Base has been changed to......' messages when reloading your saved career. Although, I was at Wilhelmshaven.
There are 2 ways to clear this message, first is to reload your patrol in which your base was changed, conduct your patrol but return to your NEW base, the second is to start a new career, edit your renown etc and start at your new base in the correct year.
The first option is easiest.
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