This is actually a useful one to save. Someone recently posited the theory that when there's an apparent tie, the game uses remaining attacker health as a tie breaker. I'm pretty sure that's not true, but quite a lot of the "visual" ties happen when both sides end up at full health, and coincidentally a lot of the screengrabs of wins due to round off happen to have the winner have higher health. This proves that when the score appears to be equal, the game doesn't revert to handing the win to the player with the higher attacker health.This demonstrates the current best theory, which is that when it appears to be a tie but someone actually wins, it is just a round off discrepancy.
To add to my previous post, here is an example of the decimals adding the total score to 1 higher than what was shown thanks to unseen decimals.