While tied at 1-1, Indoraptor used Cleansing Strike on my Stegoceratops, bringing it down to 100-something HP (less than 200).
I switched to Stegosaurus; Indoraptor took that one out in two hits, leaving me with 2 creatures.
The game suddenly declared victory for Indoraptor.
I believe this is the second time that this has happened to me, and I think it was the same problem before (I think in the previous situation, we were tied at 2-2, then a creature brought Stegoceratops below 200 health and it declared victory–I was super-excited because I was about to win, and then suddenly I lost).
I do not know if the game miscalculates Stegoceratops’s health on the display or in the programming, but I will keep an eye open if it happens a third time.