The preseason is often a false sense of reality.
Sure it is football, but it is so different from the regular season that too much weight being put into it always leads to disaster.
That is completely what has happened with the Arizona Cardinals.
In the preseason, against no quarterbacks worthy of starting status in the NFL, they forced 17 turnovers, tying an NFL record in the preseason.
Then the games started, the Cardinals faced NFL talent at quarterback and other positions along the offense and all of the sudden the turnovers stopped.