In MFN-7, SD vs. NE (game 1), the viewed game stats show 5 sacks by SD; the individual player stats for SD show 6 total sacks; and the league statistical stats show NE as having given up 3 sacks, but SD getting 6 sacks.

League total sacks: 58
League total sacks allowed: 31

Anomaly?

The "sacks allowed" stat is assigned to the offensive player whose responsibility was the player who made the sack. If there is a blitz and there was no offensive player to pick up the blitz, then there is no "sack allowed" stat on that play.

Thanks for the explanation, jdavid.