Yeah I had a mouse and failed to think that maybe others might not have 3 button mice. I put in camera controls with WASD late because of that, but I definitely didn't test anything other than my own setup. Sorry about that!
The contract generation is weighted pseudo-random: you should "tend" to see early game buildings early and late game buildings late, but other possibilities are out there. I don't think there's anything wrong with resetting but I can double check!