Why is the CSS not reflecting for standard buttons in the Oracle CPQ production environment?

Summary:

The CSS is not reflecting for standard buttons, such as save, update, and apply buttons.

Content (please ensure you mask any confidential information):

The CSS for standard buttons on the profile page, reporting manager page, and login page are not reflecting properly in the CPQ production instance, even though it is appearing properly in the test instance.

The test and production instances are of the same version.

Version (include the version you are using, if applicable):

24D Patch 1

Code Snippet (add any code snippets that support your topic, if applicable):