It sometimes happen when you crash, get disconnected or desync with the server. The game doesn't reload your full ammo count.
This not only happens with Torps on SS, but also with planes on CVs, Scouts on BBs, ammo from guns... basically anything you can load on a ship. If the server doesn't recognize the reload after battle, then you will see some of those numbers decreasing.
I wouldn't call it a bug, just a connection issue.
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