You usually don’t worry if Jason Kelce’s head is in the game.

You do when two of his snaps go AWOL one that bounces off his butt cheek because he thought the quarterback was under center.

“That’s as bad as it gets for an offensive lineman” Kelce said about his own rendition of the butt fumble after Thursday’s 26-16 loss to Kansas City a game that was lost in the trenches for the Eagles who were supposed to have that problem rectified.

“If there is one position where you get paid for consistency it’s the offensive line. There is no excuse for that. I have to get better. The other one was a high snap. I have to go back and look at it.”

In general Kelce handled his assignment against Chiefs nose tackle Dontari Poe a 2012 first-round pick who carried 3.5 sacks into the game. But his butt fumble led to one of the Eagles’ five turnovers.

The offensive line which was supposed to be a strong point with Jason Peters back at left tackle and rookie Lane Johnson anchoring the right side suffered a letdown against the Chiefs who dominated in the trench with their big physical linemen.

Michael Vick sacked just five times in his first two games went down five more times and got knocked around a bunch more. He was pressured often leading to his first two interceptions of the season.