your page is missing the set cookie value behaviors to set cookies for the username and password if the remember me option is selected.
on the server behaviors panel, click the plus button and select WebAssist -> Cookies -> Set Cookie Value.
for the trigger and value, click the plus button and select the Remember me checkbox. set the name to "rem"
repeat this, but this time, for the value select the username element and set the name to "username"
repeat again, but this time, for the value select the password element and set the name to "password"