Textbox data when tabbed to just disappears, then bring record up and info still in box..

Question

  I am having a problem with a textbox in C# VS2010 a Windows application.
 What happens, I tab to the textbox with info in box. it highlites it and info goes away. I hit a submit button. Then I call up the same record again to view it and the info is back in box.  I have other textboxes that are working fine.  Lost!!!  Please help..

Ben