Server showing IP address in URL?

To link the domain name to your server the A (address) at the DNS site (eg. namecheap.com) needs to point to your public server IP address. Recently I was having an issue with my site because when I typed baligena.com it went to the site however when I click on a link it would be replace by my IP address in the URL. It's funny when you call for tech support its a waste of time because this shit is too advanced and they won't be able to help you. What I figured out it wasn't the domain name nor the server that was causing this error but Wordpress. Wordpress has an option to specify your site URL.