On my website, why doesn't the category list appear when I ask a question? and login icon dosne`t work?

problem details:
Category List Issue:

• The user is unable to select categories when asking a question on their website.
• Instead, a frozen list of categories appears that they cannot interact with.
• This issue was not present before.

Login Button Issue:

• Clicking on the login button does not initiate the login process.
• The user has to manually add "login" to the URL for the login process to work.
• This issue was also not present before.

Troubleshooting Steps Taken:

• I Have updated the script.
• I have  cleared the cache.
• I have  restored the default settings.
  but nothing changes>>>
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  Do you have any explanation for this, Or Solutations for these problems?