Cluster Mines say "When each of these devices detonates, each ship at range 0 rolls 2 attack dice . That ship then suffers 1 HIT/CRIT damage for each matching result."
There is a new FAQ that addresses what happens when a set is dropped on two or more ships. "The owner of the Cluster Mines first chooses one ship to be affected by each of the individual Cluster Mine. Then, in an order of that player's choosing, the dice are rolled to resolve the effect of the detonation on each of those ships."
So if I drop a set of Cluster Mines and Additional Cluster Mine 1 lands on two ships, does it affect both or not?