Styling not apply for page loaded in modalcontroller (very rare case)

Among the users that I have, there is a new user who is in the midst of registering, this is like the 5 steps, which before these, all the styling were loaded properly. But when it comes to this page that is loaded via modalcontroller. All styling is not loaded other than the background that is styled with green color which is correct.

Is there any lifecycle loophole that my user just got into? because during my development or actively using the app. This has never occured to 99% of my users.