The fact that Georgia "undecideds" always seem to break Republican doesn't help matters either (shout out to Adam Griffin if he wants to go on a rant about this. )
Don't get me started on the suburbrons!
Anyway, this poll looks like what you'd expect with a couple of months remaining. GA Democrats who are somewhat competitive tend to have two periods where they peak/might lead in polling - one around the time school starts back and one a few weeks before the election (right before the undecideds start sticking the knife in). Right now, we're smack in the middle of those two periods. Most decent polls tend to account for new voters in their methodologies but if the share of the electorate that is usually first-time/irregular voters (10-15%) ends up being substantially higher, then it obviously wouldn't be reflective. As-is, though, this poll looks pretty average for Democrats in comparison to recent past cycles.