Thanks for the bug report, it's appreeciated! I'll look into the sticky hurt boxes. Do you mean that it's only the "stuck" hurt box that causes weird things to happen with the Hero health display, or does the latter happen in other situations too?
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I recorded a video of it happening on the latest version. It seems indeed an issue with hurt boxes.
Maybe you can just clear all of them at the start of each dialogue section? But might still not solve things (e.g. if attacks then do not recreate them). Could I ask if you are using Godot? Great game by the way, very interesting to take the opposite perspective than that of most games!