Authentication config is being ignored.

Hello, I have this configuration in my web.config for authentication: 
<authentication mode="Forms"> <forms name=".namesufix" loginUrl="~/Pages/Loggin.aspx" defaultUrl="~/Pages/Home.aspx"/> </authentication> 
It was working fine until today when it started to redirecting me to /default.aspx instead /Pages/Home.aspx (the value which is set as you can see). I assume that my authentication config is beign ignored and is getting the defaults values because is redirecting me to /default.aspx which is a default value of defaultUrl. Why is happening this? How can I fix it??
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