Not surprised by this.
My wife and I do pretty well by any standard, and while we have some savings now, if I lost my job, we'd be pretty fucked very quickly. Living paycheck to paycheck does not mean you're broke, struggling, or low income, it means that if suddenly you lost your paycheck you would have very little safety net. Many people might think "Oh, I don't live paycheck to paycheck," because they associate that with the idea of someone sitting at a bare table scratching together some pennies to pay an overdue water bill while the Landlandy is banging on their door for rent and two naked babies are crawling around on the dirt floor. But if you ask them, "If you suddenly lost your paycheck tomorrow would your life dramatically change," and the answer for many would be "Oh, of course, obviously."