It sounds like you have server validation on the page that is causing the problem.
look for the following code:
if ($WAFV_Errors != "") {
PostResult($WAFV_Redirect,$WAFV_Errors,"confirm");
}
and change it to:
if ($WAFV_Errors != "") {
die($WAFV_Errors)
PostResult($WAFV_Redirect,$WAFV_Errors,"confirm");
}
this will write a comma separated list of the validation that have failed to the screen. Post back the comma separated list and a copy of your page so I can examine the code.