Similar to the reasons QBs sometimes get interceptions. A DB or LB ends up where he isn't expected to be, and the QB doesn't see him even though he is in plain view. In one of his interviews this past week, Rodgers was asked about his almost interception last week, he kind of chuckled and said, believe it or not, he flat out didn't see the linebacker, even though he threw it right to him.
It would not need to be intentional, and probably wouldn't be given the lack of time to really think it through. It could be a split second reaction. This happens to people all the time in sports, which is why trusting your training is so important. You don't have time to consciously think through every action.
Like I said, it doesn't seem like the most likely explanation.