This is almost always caching. Try, in order:
- Hard-refresh your browser (Ctrl+F5, or Cmd+Shift+R on a Mac), or open the page in a private/incognito window.
- Clear your caching plugin if you use one on WordPress (look for a “Clear cache” button).
Your changes are saved — you are just seeing an older cached copy. After clearing the cache the new version appears. If it still will not update, WhatsApp us.