obviously it becomes a mental thing and when a kicker is in a slump it is hard to break out of it
After hooking 3 to the left, he tried to compensate it by pushing to the right on his game tying kick. It was a mental thing....he was thinking too much.
It is like taking the penalty kick in soccer. If you think too much, you would lose the focus resulting in missing the goal (24' wide) from 12 yards away