If you are not playing patch 1.4, this is not an easy problem to solve without looking directly at your save game files. There are threads here explaining how to do that. If you have 1.4, look for the port that has a different looking anchor. Refit ports have a square with a vertical BLACK anchor. Home port has a fancier BLUE anchor in the square and it's tilted. You can also scroll back in your "M" messages history and see the HQ message telling where you are supposed to go (assuming your home part has CHANGED from the one you left with.)
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