CMS page in the back office creates broken links

[Togusa]

I'm using a fresh install of the latest PrestaShop, i've only added the italian language and translated the rest (like tags) on my own.

I've modified the pages that are linked in the left sidebar from the tools->CMS page of the back office. The pages are saved correctly (and i can see them fine from the administration area) but when i try to open them from the main page PrestaShop tells me the requested page does not exists anymore.
For example, for one of the pages I've set the friendly URL to be "consegne" and the page the generated link points to is "www.sitename.com/content/1-consegne".
Did i configure something in the wrong way?

Thanks for your help