Seems a consistent problem for myself and a couple of my guys, our hits using strong heroes with good level troops have absolutely no effect on the opposition. Then their heroes kill us with one shot.
It’s a regular problem that hits from my 5* heroes backed with 15-20 level troops do no damage. Don’t miss, just register no damage. Then their hits kill my heroes with one hit. Not sour grapes, just annoying that I waste war hits and can’t possibly hope to get any benefit.
Is happening to others in my alliance too.