I agree it sounds like duplicate particles. Sometimes they arnt always in the particle file. With mine, I open up the particle folder and delete everything that ends with _0. that is a duplicate. Also some end up like _1, _2, _3. All of those are duplicates. Also, I have to open up the my_objects folder, and some particles are in there as well. I go to the search box at the top right of the open window and type in _0, and some always pops up. And they are hard to find! But duplicate particles are not always... Particle.particle plus another Particle.particle. It will be .... Particle_0.particle.. Get what Im saying? Try that.. I have this problem all the time.