Django admin cannot changes in models apps

Hi all, I have a problem with Django Admin. I changed the file to display the models in the app, but the problem is that Django Admin doesn’t reflect the changes.
For example, I commented out this code:, VoucherCustomerAdmin), WithdrawalAdmin)

However, in the Django Admin interface, it still showed models app commented it.

On the other hand, I tried changing the name of the admin site header using, and it worked.

Please show the complete contents of that file.

Also, do you have multiple apps with files?

Sorry, I forgot have two files.