The cookies and temporary data already stored on your computer may be causing the problem. Delete them, then test for your problem:
- Click the Library button
on your toolbar. (If you don't see it there, click the menu button 
then click .) Click and then click the Manage History bar at the bottom to open the Library window. - At the top right corner, type the name of the website you wish to forget in the Search History field, and press Enter.
- In the resulting list, right-click on the site you wish to forget, and select .
- Close the Library window.