Did you save and reload between your last shot and your discovery that the tanker is gone?
If you reload and a wounded ship sinks anytime after that, than you won't get any credit. Let's call ist a stock SH3 bug 
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SH3 battle capability upgrades: GWX2.0, JSGME2.0, SH3Commander 2.7, SH3Gen 0.8.2, TorpDamageMod 2.0, OLC GUI 1.1.5
Awaiting combat readiness for GWX2.0: SH4 effetcs for SH3, SH3Weather 1.5
Following development of: www.subwolves.com
Realism: 90%  
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