Some major poll herding going on... big red flag.
Even internal polls are getting in on it. What does it mean?
Either a big statistical anomaly occurred, or pollsters are putting their finger on the scale to hedge and make sure if they're wrong, they're wrong like everyone else. What it means is there's a higher than normal chance of an outcome that highly deviates from expectations. Could benefit either candidate. It might be helpful to look at polls which break from the consensus, but there really haven't been many lately (those that do
probably lean more toward Nelson).
Because of poll herding! It's extremely unlikely you'd get that many polls showing exactly the same margin. That's not how statistics works. Poll herding actually makes the polling average less accurate:
https://fivethirtyeight.com/features/heres-proof-some-pollsters-are-putting-a-thumb-on-the-scale/