Question about the kill death ratio in action sack

So last night I noticed that in the post game stats of the game of mongoose sumo I played displayed a kd of 0.0, despite dying multiple times and the fact that it is extremely difficult to get actual kills in that mode. However, after playing mantis breakout it did display a kd ratio. Is it that modes that can’t reflect an accurate ratio simply don’t count, or is this a glitch, just curious.