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Here, you need to check everything from start to finish: the army arrangement, the tile from which you attack the enemy hero, etc. That is, the initial conditions must be the same. Also, in order for the Path of Purity to form, in your case, you must definitely win the first battle. Maybe you played the first battle incorrectly the second time (for example, you fled or bribed)?
The thing is, everything is the same. The battle is always won, and also in the first battle. I'm not testing it for the first time.;) I wonder, could it be that it formed 3-4 times in a row, and I just recorded it?
Tomorrow I will upload this "strange save". It will be interesting if you also test it.
Sincerely, VDV_forever