It's the (typical) na.action = na.omit problem. You have missing values
in your data, so the number of observations differs between models using
different variables.
BTW with the recent lme4 package, your code throws a lot of warnings
about the use of lmer with non-gaussian family and ignored
I'm pretty new to GLMMs and model averaging, but think I'm getting some
understanding of it all through lots of reading. However, I keep receiving
an error message when trying to average models that I don't understand and
can't find any resources about. I'm doing science education research trying
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