I've been editing Blueprint templates, creating new user and global templates in Confluences and I haven't had any problem till today. I'm trying to edit one of the templates in Space Settings--> Content Tools --> Templates, however when the editing page is displayed about 70% of the page is blank and the editing area is compressed (as shown below).

The issue come up just when I try to create or edit a template. When I use one of the templtes, it's displayed correctly.
The troubleshooting I've done so far is:
- Delete the cookies
- Change the browser
- Review the components of the page, where we can see that the width of the frame is 100% and there's nothing in the blank area

Does anyone know what is going on?