Medium_HP
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I haven't yet figured out the cause of the bug. As correctly noted, this is an old bug from the SoD (Shadow of Death) expansion.
I only know the method to fix it. By the way, I myself encountered this bug only once a long time ago. And I have a hypothesis that this bug appears when using the "space" key in the castle to exchange heroes. I don't use this button myself, which is probably why I don't encounter this bug.