It sounds like you are getting some type of server validation failure on the page. Take a look at the code toward the top of the page and look for this php code:
if ($WAFV_Errors != "") {
PostResult($WAFV_Redirect,$WAFV_Errors,"contact");
}
When you find this you should update it so it looks like this:
die("the validation errors are: " . $WAFV_Errors);
if ($WAFV_Errors != "") {
PostResult($WAFV_Redirect,$WAFV_Errors,"contact");
}
After you make this update upload and test the page, if you get the message about the validation errors please post back with the results. If you do not see any message let me know and I can open a ticket for you on this.