May be because of The Web site might not be fully compatible with Internet Explorer and might not be displayed correctly. You can enable Compatibility View for the Web site to see whether that resolves the problem or not.
To enable Compatibility View for a specific Web site that is not displayed correctly or that is not working correctly, follow these steps:
Click Start, and then click Internet Explorer.
Enter the address of the Web site that is not displayed correctly or that does not work correctly, and press ENTER.
Click the Compatibility View icon that is located to the right of the address bar.
May be Compatibility view is not required, and the Compatibility View commands will not be available, if the Web site was designed for earlier versions of Internet Explorer.
After you enable Compatibility View, the Web site will automatically refresh, and you may see a message that states that the Web site is running in Compatibility View.
For More help you Can go on These site:
http://support.microsoft.com/kb/968089