Going into my current battle against the AI, showed Victory Very Likely. Watching the battle in viewer, shows my ships didn't do well, in fact I lost all three of my medium hull ships and they had surviving 3 small ships and one transport. After finishing the battle and going back to the game screen, I won, having 2 remaining medium hulled ships left and the AI nothing.
I noticed this prior to this when I killed 1 of their ships but, I lost it showed I killed none of their ships and just thought it was a fluke. This appears to be common though and broken.