Submit button returning to Login screen

I have a form which contains some options the users can select and then there is a submit button.

when submit is click the form's content gets sent via email.

however, some users are experiencing that when they click on the submit button, they are being transfered to the login.fwx screen.

i have this in the beggining of the page.

<%
if empty(Auth.userid)
server.Transfer('login.fwx')
endif
%>
<body>
<center>
<img src="/images/wtlogosmall.gif"><br>
<font name="Tahoma" size="2">| <a href="login.fwx?logout=1&<%=SYS(3)%>">Logout</a> |</font>
</center>
<% if not used('sign.dbf')
use \sign.dbf in 0 alias signTable again
   endif
   cName    = ''
   cAddress = ''
   cCity    = ''
   cWork    = ''

cUserEmail = upper(trim(Auth.userid))+"@wirelesstoyz.com"
%>

etc.. etc..