Website "can't" export

[sakulmore]

Hello, i have two problems:

First:
If i want export website, the program don't export it. It exports only first file, and other not.

Second:
If i create navigation menu, and check "Site navigation bar", then if i create new page, it renames all navigations bar to .php file.
Example: I creat NavBar with buttons "Home", "Downloads", "Contact Us". If i create new page (doesn't matter if is duplicate or new page), it looks like: "Home", "downloads.php", "Contact Us" <- Order of renames is random. Sometimes is like "home_page.php", "Downloads", "Contact Us", sometimes "Home", "Downloads", "contact_us.php".