The trouble with these polls, I’d imagine, is that they tell you what people were thinking in the recent past, not the terrifying present. And in that present, we know this Phillies team is yo-yo-ing up and down, yanking people in and out, and just barely keeping themselves in the playoff picture to keep you from totally giving up on them (unless you are some commenters, who desperately want you to know that they gave up before you, and are therefore smarter. Fandom!)
So, in terms of “fan confidence,” the numbers you see are from a period in which the Phillies looked bad, and dumb, and ineffective, and had just fallen 4.