Head bolts broke through?

Thank you gentlemen for your time, I had "surgically " cleaned and tapped all holes, and used the arp lube on threads and washers as directed. I have been scratching my head over this all afternoon when my son came in and was admiring my tourqe wrench and says hey you know this socket has a crack in it". Sure enough there was a small split in the socket so I believe/hoping it was just spreading and slipping at full tourque. I will investigate further and let you know if I find anything different.