Smoke is rendering strange

Hello I am working on a little render and wanted to use smoke and it somehow looks strange when I render it. Technical data of domain:

Thanks for your help

my setup is different in the model I was working on last
I think you have to uncheck density turning it off in your texture settings for the domain
my setup has emission and emission color checked on with a color ramp.

Hey thanks for your reply…The problame was a differant one.My mistake was that I did’t use a cube as domain.