"Path of Evil 3" (3rd map)

I don't understand how to manage so that you have more heroes left; otherwise, after 1 day, Xy disappears, then the 2nd hero disappears, and you barely manage to capture a castle with the 3rd. When buying new heroes, it says that you were warned and kills the heroes... Is this how the map is supposed to work, or is it a bug? It's simply impossible to play with only 1 hero on 2 fronts. Now, an error has started occurring when passing the turn; it seems the opponent went somewhere they shouldn't have...

There's a meeting place there, great! But if you bring even 1 hero there and pass the turn, and voila, you have no heroes left, awesome!)

So, is this a feature of this map?
I'm providing 3 screenshots with the errors.