I guess it is the hitbox on the big guys. Normally you can jump over them after you cure them, but if they are this close to the ledge you can't make the jump. Maybe you have to turn off the hitbox after they are cured :)
The normal zombies doesn't collide with the player when they are cured. I coded that for them and the boss enemy is just a duplicate of the normal enemy with upgraded stats and different animations and they share the same script, so i have no idea whats causing this
