it could be "ghost ships" - the ships that you sunk before but they respawned and you sunk them again. You can recognize them that they are on the same course.
Even a part of convoy can respawn like this.
This feature is quite annoying (and waste torpedoes as well).
No credit awarded can also happen if enemy will finish your damaged target (kill-stealing).
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Kapitänleutnant Vlad von Carstein - U-Flotilla Saltzwedel - U-123, Type IXB
SH3 GWX 3.0
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