devtrackers.gg
This is, uh, not intended behavior. Our engineers are on the case. Did you happen to gain an insane amount of life in one game?
Not sure about OP, but I did replicate it by dealing damage twice with creature with lifelink and maxed out +1/+1 counters in single game. It fixed itself after another two billions of lifelinked damage.
That’s hilarious. Integer overflow problems have integer overflow solutions