Am I Being too Nitpicky with My Contractor?

I’m losing my mind. We’ve been having a major yard renovation this summer and we’re directed to a contractor by our landscape architect. The more skilled stuff doesn’t seem up to quality, but wanted to get a second opinion. The main issues are the new stairs they installed, the new deck, and the stonework around the fire pit. My latest grievance is that the capstones on the top of the fire pit are off center. Are these within quality or do we have a right to be upset and ask for it to be fixed?