It also happens when several ships start to limp inside of it. Everybody is trying to change course to avoid the slowing ships and it can be quite a congestion. Since you did injured some of the ships, that could be a possibility too.
BUt they do weird things too when they alter the convoy course like mentionned above.
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The sonar operator is the only sailor that can tell the captain to shushhhh and get away with it... 
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