Yeah. I just wish all these sites could agree on TFL numbers. Almost feels like an unofficial stat
The NFL has an offical tackles for loss stats, Stats, LLC. has their own version. The NFL official TFL is not useful. If, for example, Robert Quinn sacks a QB, he gets credit for a tackle for loss and a sack. If he knocks the ball out of a QB's hand, he gets credit for a sack and forced fumble, but not for a tackle for a loss. The NFL version dos not distinguish between a sack and tackle for a loss on a running back (with the caveot I explainded)
Stats, LLC, since 1991 has been tracking stuffs, which is a tackle for a loss on a running or passing play that does not involve the QB. If a RB is tackled for a loss on a screen pass, it's a stuff. If a running back loses a yard in a running play it's a stuff. If two tacklers make a tackle on a running back they get 1/2 a stuff each.
Stats, LLC has the most useful number because you can add stuffs plus sacks as plays behind the LOS. The NFL number does not work that way, you can add sacks plus tackles for a loss and you get a higher number because it double counts sacks and excludes plays in which the QB and Rb lose the ball.