Solution: Sometimes Wattpad loads chapters in reverse order or via javascript. Use the FanFicFare method (Calibre) as it handles dynamic loading better than simple web scrapers.
This is the important part.
Do not use downloaders to:
Understanding the demand helps explain why these tools exist. Users typically look for a Wattpad downloader for five main reasons: Wattpad Downloader
Once you have your .epub or .pdf file, here is how to open it: Solution: Sometimes Wattpad loads chapters in reverse order