I think nothing of that. Very unlucky (-22,5%); At the night (100 % bonus for defensive troops); Flag used (2% defense strengh); Paladin in the village (maybe improved item for catas). All in all a bad think, but the reality.
Only the catapult item has to rethink. But that's another tactical option for the user. In addition to that, thats not really a bug. Maybe you have to create an idea to this called: balance of catapult item (improved items).