Do we know of many examples of this? Is there any context or explanation for similar phenomena?
Could you give us any more details about the tombstone / period etc?
Pomeroy, and Fant and Lefkowitz, make it clear that the virtues adhered to by the aristocracy and outlined in the laws (e.g. emphasis on pudicitia, univira etc) were not always adhered to by the lower classes. And Rome governed a number of territories that had different laws entirely.