Heat Stage 1 suddenly became Aux Heat in Thermostat Summary

Yes. When your system type is gas beestat will treat the aux column as regular heat. The only problem is then your metrics will be comparing you to other gas systems. Big lose-lose I guess and the is currently no way to change that.

I definitely hate to leave this with that answer. The best idea I have at this point is to allow you to change the system type you compare to in metrics.