devtrackers.gg
One of them probably died and got revived from the modifier "Endless Ranks" whilst having Deathmark applied. During that time no other character had Deathmark and one of your characters dealt damage and got inflicted with Deathmark from the modifier "Safe Haven". Is that what happened?
Not op, but they don't revive with endless ranks when they die with death mark.
You are correct, they don't revive when they died with Deathmark, my bad. We are looking into this now.