Could be a combination of things. What is in your rub? If there is a lot of sugar that could contribute. How long and at what temperature did you cook them? Mine always come out dark brown to blackish whether I cook them in the CS or indirectly in an offset or Weber Kettle. It could be a function of the smoke too. Bottom line is, they came out tasting great and that's what matters.
Agree with CT-Q. Paprika and sugar both burn. Try turbinado sugar as opposed to processed &/or brown sugar.
What temps you be cooking at? Shoot us a few details
Just as an experiment, next time try one rack with just salt & pepper and the other rack cooked as above. Compare the two. May not be a lot of difference in taste unless you crank up the heat in your rubs. Worth a try.
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