If you publish a new page and it looks something like the image below, it's likely due to using a filename that exceeds the 40 character maximum permitted by Site Builder.

You can easily fix this by returning to the Content section of Site Builder, and renaming the file. 

Click the icon to the left of the file causing the problem to edit the name. 

Change the name so it adheres to Site Builder standards. Now your page will display properly.

Note:

• keep file names below 40 characters.
• use all lower case characters.
• avoid spaces and special characters, except - or _.