Williams always plays like this.
Just in other games, people don't throw the ball at him because he is "in coverage". He just never can play the ball, so you can easily complete passes to his man - even when covered. And if you miss? He will not pick it off.
But as the #2 corner when a lot of our guys were hurt, it was more something we should have expected. He isn't worth the money, never really was, but this one is not his fault. He is what he is and without him the Bengals still complete those passes.