Escape

Hello. I started playing a scenario, and in the very first battle, I encountered a problem: the "Fireball" spell doesn't work on enemies at all and doesn't hit in an area; it only hits the enemy directly. But there's a catch: it doesn't deal any damage, and the hero's skill doesn't work either. After looking at the map's internals using the HOMM V Map Scripts Editor, I noticed that the spell had been modified, which raises the question: why?