Dark Swarms or Distruption Webs are not controled by a player. They're automatically Neutral. So if your map requires you to have seperate triggers per player for their Dark Swarm will not work. I had to quit that idea for a map of mine because I was trying to make actions happen for each player. Triggers should be...
Condition: Neutral commands at least 1 Dark Swarm.
Action: Move location onto Dark Swarm Owned By Neutral or All Players
Action: Create # Zerglings
Action: Remove Dark Swarm For All Players.
Action: Preserve Trigger
I hope you're not having each player spawn their own lings from the Dark Swarms they cast.
If so... I'm sorry to give you the bad news.
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Cannot connect without being direct but always in neglect without anything to reflect, to those who live in fantacy with a real world to see, but the world has one truth, hanging by a noose, by those who simplify and deny can only fly by the beliefs of no gravity. Theories, Facts, are not lies anything else can be denied. The world was strong in the side of truth. Two thousand years ago was killed by a noose. The burning of buildings, and the killing of men, the degrading method in "Never Again". The same people in the side of truth have brought wonders and maybe the end too. Nuclear weapons as it seems can destroy everything, everything without natures approval of removal of man kind cannot be rewind. So I say unto thee, "Words Of Wisdom, Let It Be".