Usually there are many cards which damages the players, Like wall of lightnings, Sea Sprite etc.
You should check the duel logs when one receive the damage. If the problem is still there, please send me the screen shot and other details.
Thanks.
Awesome game, two things i've noticed though at least in the first area: 1. ranged enemies are ridiculously OP. They hit as hard as melee and run away from you. Having four ranged units spawn at the same time will kill me almost every time at lvl 4 in the first area. 2. Every once in a while my character will freeze. A little frustrating to have a single little imp smacking my character as she stands there taking it even though I'm clicking on the enemy and pressing 1, 2, and 3 -until I die. After she revives she can move again though. It's happened twice.
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Usually there are many cards which damages the players, Like wall of lightnings, Sea Sprite etc. You should check the duel logs when one receive the damage. If the problem is still there, please send me the screen shot and other details. Thanks.