While playing that scenario I encountered two bugs. First of all, the War Elephant (which I converted from the red enemy) sometimes while attacking buildings had this strange animation and was hitting the building sideways, not frontally.
Second, I was making heavy catapults and I discovered two more Gaia catapults. I had 3 mine and 2 gaia - 5 total. While double-clicking the catapults it either selected the two gaia ones when clicking them or the three ones I made, not all 5 catapults. Maybe the game treats gaia and created units differently.