fire emittors being merged?

I have a rocket, with four nozzles, each with a circle inside that is set as an emittor for fire. When I test it, it’s like there is only one emittor in the center between the four nozzles.

Here is a pic:

I expected it to be 4 different plumes centered on each of the nozzles’ circle emittors.

EDIT: I figured it out. I increased Domain > Resolution > Divisions from 32 to 64.