Darker vfx effect seems to be in front of lighter ones.

Hi, I have two vfx effects. A dark one for the exhausts of my vehicle and a lighter for the dust. The problem is that it always looks like the dark effect is in front of the lighter ones. Which looks odd. Unfortunately I couldn’t find anything like that on google or in the UE forum.
Does this have something to do with the transparency of the effects?

Thanks for your help.
Smoke.bmp (1.5 MB)