Strange error while saving draft. Loads the index page un the draft div.

Ok so this is a very strange error that a new WP installation is generating. So everything looks great, the install.php runs perfectly, the dashboard looks great. So far so good. I install the theme, it runs perfectly.

Create page: Looks good. I add the Title and when the auto save kicks in. first error. The whole index page loads in the saving draft div (view image, its hard for me to explain here: https://buroeditorial.com/error/picture-1.png) So, then I add the content to the page, and the same mistake happens after the auto save…

Anyhow I decide that the mistake, as obious as it is, I decide to publish. The publish button then loads the Index.php The page was never created and I can′t add content to the blog.

This happened once, so I reintaled. Twice and again.

Where is my mistake, I have a deadline, the client got the domain and hosting and now im stuck. Any ideas?

Thank you so much!
Sorry for the english, not my native tongue.

Guillermo