So today my team is starting to work with the new 4.13 version of unreal and unreal is making use of a “global spawn rate scaling” now. I am not sure what that means excatly so far, but if you want to “fix” ur spawn rates for the ur particles again then make sure you are unchecking this guy right here.
This global spawn rate is active by default.
Hope this helps you guys to not go nearly crazy like me in the morning.