In any sport, referees sometimes make mistakes.

After all, no one’s perfect.

But major league football teams have been irritated by the unusually high number of bad mistakes made by the referees these days, including a bizarre call on Monday night.

The National Football League (NFL) is using stand-in refs.

The league’s usual referees are in a contract dispute and are unable to reach a new collective bargaining agreement.

So the NFL has brought in replacement refs that aren’t as well trained or as experienced.

And they’re making some bad calls.

On Monday night, there was an especially poor call made by a ref that directly affected the outcome of a game.