Incoming Links 404 error

Hi everyone… I hope you can help cause this is driving me nuts.

I set up a site and have since mapped it to a different domain. I added some pages just recently and set up some links to them on a hard coded HTML/CSS menu that appears on each page. The problem is that every time I click the tab on my new menu to access the pages I’ve just created I get redirected to a 404 error page. The kicker is that going into the backend of wordpress and clicking the “view page” button (off the page I just created) takes me right to the front end of the page with no problems and the URL of the new page is identical to the URL I just tried to access with my html/css menu. So in short I can get to the new page by going into the back end but not by clicking an external link on the front end. I noticed also in Safari that some odd “stuff” gets added to my URL and it attempts to go to my 404 page. However, if I stop the load of the page and delete the “stuff,” then click return, the page loads just fine. AHHHHH! ??

I have unmapped the custom URL I was using and tried deleting and recreating the pages under different names but no joy. All my other pages work great and they are had taps in the same HTML/CSS menu that I mentioned earlier. Any ideas?