The effects should behave exactly the same in the editor and in Unity. Maybe what makes your effects seem to be different is the loading time of your scene (if the "Play On Start" attribute is checked), which can make the first frame very long and can make your effect behave strangely (if the first frame takes 5 seconds and each one of your spawner gets activated 1 sec after the previous one, when your scene will start, the 5 first spawners will be active for example).
The "Restart" button on the PKFxFX components just does this internally:
If this doesn't seem to be the cause of your issue, you can send us a repro project to:
support _at_ popcornfx _dot_ com
Hope this helps,