These numbers are unrealistic when considered together.
Not at all. It's clear that in this election OH has moved to the right and NC to the left relative to the average. With that in mind, these results are reasonable assuming a Clinton national lead of 4 or so. Polls are naturally going to come in on both sides of the mean (if they consistently don't do so, it's suspicious.) Expecting polls from different states, even by the same pollster in the same time period, to be perfectly in line with each other is misguided.
Exactly, one needs to consider the MoE on multiple polls (about 4% in this case).
