As a simulator of Failures to make a normal game? (Pathfinder: Kingmaker)

Shorter got, game a miss, not otherwise. I have noticed you or the enemies don't miss when the enemy is below you LP( although what the enemy level is not clear) But if the enemy is like you, mistakes happen much more often. Pure random, many times I was tested, let's take the same lights, sometimes you will cut very fast, in number of four pieces,with a minimum of mistakes, and if to reboot, the same lights you kick the only way, and you have 10 shots 8 misses.
Generally good people, are there any ideas as a simulator of failures to make the rules of the game? Preferably more concrete, and low everything else.