What could be causing my particle system to start a few seconds into the sequence?

I have a particle system that starts at ground level and goes up, in the level editor. But in cascade or when I play the game the system starts with many particles already significantly above the start height, why is this?

Also how do I give a “kill height” or “kill box” equivalent for a GPU particle emitter?

if the particle isnt activated trough a blueprint or other means, it means it will start the moment you run the game, this can result in the offset.
At least, thats my best bet without checking out the setup.