WeWork sells prospective customers on the idea that its energetic workplace culture will rub off on tenants, keeping their employees happy and productive. But WeWork’s own employees have noticed an irony about the pitch: Executives in charge of keeping WeWork’s workforce humming haven’t stuck around.

Nearly a dozen leaders and managers in WeWork’s human resources department have left the company in the past year or are in the process of leaving, even as the company’s workforce was mushrooming in size. The departures could add to questions of whether WeWork can keep its own labor-intensive house in order as it tries to raise several billion dollars in a public offering as soon as next month.