Why doesn't fancybox settings save in Drupal 7?

Question

Drupal

Hello! This is the first time I've encountered this problem! Drupal has fancybox installed, it has a settings page, when I change something on this page, for example, uncheck or specify the width of the window and click save, the settings are not saved, i.e. Drupal writes that the settings are saved, but when I go back to the page settings, I see that nothing has changed.