Some mysterious damage issues (Disciples: Liberation)

At some point (the first playthrough, after level 37), a strange addiction appeared.

My difficulty level is Madness. Those. attack power x1.5, health x1.25.

Fight with the enemy - demons. Taken the Nephilim skill tree for demons (i.e., + 20% hp and all that).

I have the Knights of the Underworld (this applies to ALL types of troops, the knights are here for an example). My knights have 2.1k health and 335 attack power. This is with a bonus from the Nephilim. In theory, the enemy should have about the same amount of HP at the same level and 1.5 times more attack power. However... The knights of the underworld have 645 attack power (before the use of rear skills) and 885 (although there is only a 15% bonus to physical damage to the level) in battle. At the same level as mine (in this case - 41) and 3.3 thousand hp.

What should be with the correct calculation: 335 * 1.5 = 503 base attack and 576 under the buff. And hp should be, respectively, 2200.

What could this even mean? Why such insane multipliers?