Tons of Gamebase entries in my missions

Okay I've been wondering about this for like, two years, and I think the time has come to ask the question:

Why do I have 40,000 lines of Gamebase objects being inserted into my missions by the Mission Editor?

I'm sure I've screwed something up, but danged if I know what. They don't seem to cause a problem--except when I delete them manually out of my missions! They look like this:

new GameBase() {
         canSaveDynamicFields = "1";
         position = "0 0 0";
         rotation = "1 0 0 0";
         scale = "1 1 1";
         dataBlock = "tireEmitter";
      };
      new GameBase() {
         canSaveDynamicFields = "1";
         position = "0 0 0";
         rotation = "1 0 0 0";
         scale = "1 1 1";
         dataBlock = "tireEmitter";
      };
      new GameBase() {
         canSaveDynamicFields = "1";
         position = "0 0 0";
         rotation = "1 0 0 0";
         scale = "1 1 1";
         dataBlock = "tireEmitter";
      };

And yes, they are ALL of the tireEmitter datablock!

Any input would be greatly appreciated!

lee

Edit: I should mention they are in the ClientMissionCleanup Simgroup.