by Deathstroke
Without opening and counting the cards in my copy, I'm going to ask if you used all the cards required for a 3-player game? I'm pretty sure the number of building cards increases with the number of players.Another possibility is that you may be mistaking the symbol on the round card that means to build a special building for the one that means build a regular building.
That's all I can think of off the top of my head.