Asp.net LoginStatus - 'log out' shows but not logged in yet

Why does my loginStatus show 'log out' even though I've not actually logged in yet?

<asp:LoginStatus ID="LoginSta开发者_JAVA技巧tus1" runat="server"
LoginText="Log In"
LogoutText="Log Out"
LogoutPageUrl="~/Default.aspx"
LogoutAction="Redirect" />

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Check authentication mode in web.config. It may be set to "Windows" change it to "Forms".