Damage calculator.

Hey guys, I have a question about damage calculation. I didn't want to start a separate thread, so I'm posting it here. HotA v.1.6.1. 23 Cyclops are attacking (damage 16-20, attack 15). The hero has an attack of 18 and Expert Ranged (50%) + two artifacts that modify it (5% + 15%), so the total ranged attack modifier is 70%. They are being defended by Nixie Warriors (defense 17, they ignore 60% of the attacker's attack). There is no hero defending them. The terrain is neutral for both sides. Here's how I calculate the damage: Total attack of the attacking creatures and the hero: 15 + 18 = 33 Attack with the Nixie Warriors' modifier: 33 * (1 - 0.6) = 13.2 Final attack and defense difference (diff): 13.2 - 17 = -3.8 I calculate the multiplier for the base damage using the formula: 1 + 0.025 * diff + ranged attack This gives: 1 + 0.025 * -3.8 + 0.7 = 1.605 Base damage of 23 Cyclops: 368 - 460 With the multiplier: 590 - 738. But the game shows 562 - 703. Can you tell me where the error is in my calculations?