Construction work is done differently than, for example, watchmaking.
Therefore – this time without irony – please don’t worry. These stones are neither defective, nor will anything happen to your house. If anything, you might still see things that cause you to gasp and curl your toenails. But on construction sites, generally "coarse motor skills" are at work, who in the end, through the collaboration of various trades, produce exactly what you ordered. Namely, a house.