Lets try this fix:
In the Finder, go to your User Account>Library: drag to the trash the following folders or files (in bold):
Safari folder (holds bookmarks, history, download history, site icons)
Caches>Safari folder
Caches>Metadata>Safari folder
Cookies>Cookies.plist file
Preferences>com.apple.safari.plist file (preferences)
Empty trash and restart Safari. Safari will now revert to its default values.