I agree with comp,check your negative posts to make sure it is tight but not too tight...i had the same problem with my recent dual coil build...it is a macro sleeper build so both coils are made out of a single piece of kanthal. I had the same issue with this and it turned out that one of the negative screws was a little loose, i tightened it up and it works great...both coils glow at the same time....so i would try that first and then try firing the coils and do some pinching with tweezers or pliers, and see if that fixes the issue.