some page show Ip instead of domain

Hello I am using a droplet for wp my site is showing and redirecting to the domain name on most pages but for example, if I type a page that does not exist the IP show up instead of the domain, and when I go to my domain/wp-admin the login page shows the Ip instead of the domain though when I log in the domain name appear instead of the IP normally. I also tried to set up a verification email for registration but the email domain returns an error with IP instead of the domain. so what might be that issue? I check the database wp-option and wp-posts and meta in wp I think there is no issue there.

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Accepted Answer

fixed I relace the ip with the domain in the etc/apache2/sites-enabled/000-default.conf