When did you sink the missing freighter, before or after docking at Wilhelmshaven? Any time you dock at a port, SH3 believes that you've started a new patrol. So, what seems like one extended patrol (Kiel to Wilhelmshaven back to Kiel) is actually two patrols according to SH3's accounting. If you sank the ship on the Kiel to Wilhelmshaven leg, you might want to check and see if SH3 applied your missing tonnage here.
On the other hand, it's possible BdU just isn't very good at it's arithmatic. :rotfl:
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