When I play the physical version of Azul, I redraw tiles if all four that I place in a single factory are the same color. Recently Board Game Arena added Azul and I started a game. One of the rounds started with four blues in a factory:
I started writing up a bug report, but looking at the rules I don't actually see anything that disallows that. Am I playing with a house rule? Is there any reason to not allow this situation?