So for roughly about a year there's been a glitch when you group items and then link that as the object to emit from an emitter. When you play the level and close it. The grouped objects are duplicated next to the emitter. This never used to be the case. I haven't used badlands because of this issue. Cos I love to create physic based particle effects. It never used to do this as of a year ago and I've waited nearly year hoping it'd change.