Well, I sometimes wonder as well.
Losing a fight 3-4 times in a row, with me performing 90-95% destruction, but suddenly winning a fight with an utter and completely misrable attack of whooping 43%.
Seeing more draws as well lately. But oh well. I honestly don't care enough to check any consistency or something. Just switch to the mainvillage and attack again in the BB, once I remember I still need X wins for the daily bonus.