ERROR MESSAGE LINK VS LAYOUT

Today I am updating www.redeemercatawba.com and in the preview mode everything looks good except for the 4 links (which I did make any changes too) setup on the 4 images midway down the homepage "About Us".  When I click any of the 4 images/links a window opens with this message:

This is the layout


Page not found

The page you requested could not be found.

Prior to receiving this message I had done nothing to change the way these links are set.  After receiving the message I did attempt to reset each link to its original link page to see if this would correct the problem, but it did not. 

I do not want to publish my changes with broken links since the current site comes up with all 4 links working as they should.  Look forward to resolving.