Go into the details of the poll.  

 
http://cdn.prod.website-files.com/65fc824cf835683ce2d3549b/66ba4069b73a13894a56414d_Independent%20Center%20-%20Battleground%20States%20Poll%202024.pdf

 
The poll had +2 more people responding as “Very Democratic” vs “Very Republican”. But more importantly, the poll over sampled women by +4.  

 
I think Hispanics and Asians were under sampled as well, but I only know the national averages, not the averages in those states.  

 
I discovered this earlier with a Financial Times poll that found Kamala had a +1 in “trust on the economy”. Look into the poll details and you find they over sampled Democrats by +4.