There is a significant difference in averages of rcp 538 and this site:
https://www.electoral-vote.com/evp2020/Pres/Maps/Sep04.htmlThen there is the one on this site:
https://uselectionatlas.org/POLLS/PRESIDENT/2020/polls.phpAll of them have Biden leading but some have it as close and others not so close.
Yet, RCP has a no tossup map where the prediction is 352-186 for Biden.
They could end up being right or coming close, although I am not confident yet
about NC and OH.
One of the keys to understanding the differences is which polls are possible outliers
Trafalgar is usually higher for Trump and Rasmussen is certainly not in line with the other polls either.