help! Cannot delete a user

A user cannot delete their account from their public profile. Yet it shows him that his account has been successfully deleted.
And I also cannot delete the sound account from the back office. It shows me "no user has been deleted" in back office.
However, the other features work.

https://superpet.tv

@David Beaudoin
Go to your database and remove user manually from t_user table. You should get error what is problem and what foreign key blocks it.