Moved My Site now Main Nav links no longer work

The old development site is located here which is important to this example
Now I have taken this over from another developer and they provided me all the files and a complete database backup.

On the old site in the main nav if you click about etc… you go to that page.

In my new development site if you click about it goes to a mess of my actual company website.

Can anyone figure out why I can’t seem to get the link to point in the right direction?

The new development site is.

And the old development site is

I’m guessing by “mess” you mean no CSS.

The old site is using absolute path URLs but the new is using relative.

WordPress can navigate to pages OK depending on the permalink structure and how the htaccess file is written, but it looks like it can’t find the CSS file.

Maybe just use an absolute path?