Most of these polls operate by calling people, most people Gen X and younger don’t pick up their phones for unknown callers, so it’s mostly old people being polled, plus the polls from conservative pollers purposely target conservative areas knowing that it will skew the polls how they intend for the polls to lean.
The last few elections should show that people are still overwhelmingly voting Democrat, but things are still far closer than they should be so we all gotta get out there and vote like our freedom from fascism depends on it, because it absolutely does.