[R] Model averaging using QAICc

Hi all, I am having some trouble running GLMM's and using model averaging with QAICc. Let me know if you need more detail here: I am trying to run GLMM's on count data in the package glmmADMB with a negative binomial distribution due to overdispersion. The dispersion parameter has now reduced to

[R] GLMM parameter estimates giving opposite trends

I apologize if this is a simple question. I am running GLMM's using glmmML and model averaging with MuMIn. One of the parameter estimates for a parameter (firefreq) in the best model is giving a positive number, where in reality I know this to be a negative correlation. I have checked and double