cookies and cache in ie8 vs ie9

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IIS7

ASP.NET

IIS

This is my logout code.

FormsAuthentication.SignOut()
Session.Clear()        
Response.Cookies(Constants.CookieCompanyCode).Expires = Date.Now.AddHours(-1)
RedirectToLogin()

this is the meta section from master page:

<meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate">
 <meta http-equiv="Pragma" content="no-cache">
 <meta http-equiv="Expires" content="0">
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

This is working as expected on ie9 but on ie8 it redirects to login page but still shows header menu from previouspage and you can click on it and enter the website.If I delete cookies and cache after logout on ie8, it works correctly so I am assuming that it has something to do with them. Any suggestions ??