Menu distoyed after edit page name

Hi team.

This time I use Nicepage online to crete site.

• Create Page-1
• Change name to Inicio
• Add content
• Create menu
  (like image Nicepagebug.png)

Then
- Add page
- Add contenet (Section features)
(Here ok)

But When I change name of the page to juego-total the menu change like show in image Nicepagebug2.png

After that I try to preview but I get message showed in Nicepagebug3.png

PD. Some similar happen in desktop edition as I report in previous question (About title> )

Thanks