If you have the 3-burner unit the rear two burners have a lesser btu rating than the front burner, so those those may have a lower 'low' rating than the front one does.
Having said that, some stoves have an adjustment for the burners, but I'm not sure if the Dometics do. I'll look at ours when I get a chance in a day or two if someone else doesn't answer.
Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin!