Not knowing the size of the convoy (rows) and the speed makes the following a bit iffy. But it could be that the front vessels reached the waypoint and started maneuvering for the next. Something at 8 knots takes about 30 min to move 7 to 8 km. Which could be the size of the convoy.
But if flares were shot in the air then I think you should seriously consider your own presence to be the trigger. (AI friendly units could be, but rare coincidence) It might have been for just a split second and the destroyers have allready lost you.
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