Looking at the enemy team ‘Scout’ I noticed that all of the enemy team seems to have higher stats. Queen Mab has 63 Hit points. To make the comparison correct I mirrored the enemy team exactly. My Queen only has 55 Hit points (other stats are different too) with exactly the same (Goblin) team. This is on the PC.
Both mine and theirs are Mythic in Rarity. All of my Kingdoms are level 10 with 5 or more stars.
Screen shots attached: