Sounds like you're getting RNG-screwed. The combat isn't as random as you're all making it. This game has RNG like any other game. The Random Numbers are generated with algorithms that are only so complex. If you've ever restarted a load and tried the same thing, you'd notice that the same thing happens (if you don't check the Regenerate Random Seed option). Combat is not truly random, so odds generators will not be perfect.