This guy had the same problem as me https://answers.unrealengine.com/questions/853148/i-have-a-spawn-delay-in-my-emitter-that-i-cant-get.html (Emitter has minor delay at start despite there being no delay set), he said he fixed it by setting “Warmup Time” to a value of 1 but he failed to mention where warmup time is. I dont see it under required?
Never mind I found it, just click in the empty space of the particle system and look under the “Particle System” settings, its not under the “Required” or any other module of a particular emitter, dont know why that was so hard for the 1,000,000 other posts to mention after they found the solution.
Seriously guys its not hard to come back and properly describe how you solved the problem, dont just say “NEVER MIND I FOUND IT” like a jackass.