From what I've heard, rushed, poor-quality construction with questionable material choices. Also, an extremely restrictive HOA.
https://archpaper.com/2016/11/celebration-fl-mold-shoddy-construction/
Some roofs of Celebration’s 105 condos and 4,000 single-family homes are shrouded in tarps to forestall leaks, while balconies, separated from buildings and supported by temporary beams, are completely unusable. Mold creeps up the insides of nylon-lined walls, a disastrous, moisture-trapping material choice for the Florida climate.
Conditions are so bad that the condo owners’ association filed a civil suit this spring against the property owners that asks for $15 to $20 million in repairs. Residents say that despite the allure of Celebration’s compact layout and the imprimatur of famous architects, the buildings’ lack of structural integrity makes it difficult to sell homes.