Why does the ship gain health when hit?

During the Siege of Odessa battle, the ship at sea mysteriously gets extra health. Sometimes it happens when I hit it with snowman infantry. One time it was nearly destroyed with less than 30% health left then it suddenly got full health and I saw no support craft before hand and even if I had, support does not completely restore full health like happened here. Is this a new bug?
2015-07-11 13:21 Comment Share

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