Why my GitLab instance is resolving to

I would like to know what is wrong in my GitLab instance because it is resolving to in some points.

It appears when I click in ‘Your work’, New navigation and when I resolve conflicts.

Have someone a idea that why it is happening and what setting I have to change to solve this?

Whats the value of external_url in your gitlab.rb?

In the value of external_url param, I have my internal DNS URL. My DNS URL resolves to the IP where my GitLab is running.