Why does Universal Email redirects to my login page?

I have a page named iron.php that contains the following:
3 static plugins - A login popup, Main nav bar, and a repeating table
1 email form that lets users attach a file to the email.

I have been trying to figure why does UE redirects me to (http://www.buildersfence.com/myLogin/logon.php?failedLogin=1) asking for me to enter my user name and password. I have moved Framework plugins code from the bottom to the top to prevent UE from redirecting me to the logon.php page but I got the same result; it redirected me to the logon.php page. Then when I added the following code <?php
error_reporting(E_ALL);
ini_set('display_errors','on');
if (($_SERVER["REQUEST_METHOD"] == "POST")) {
var_dump($_FILES);
}
?>
I got the following error message

Warning: Cannot modify header information - headers already sent by (output started at /services/webpages/b/u/buildersfence.com/public/iron/iron.php:5) in /services/webpages/b/u/buildersfence.com/public/webassist/security_assist/helper_php.php on line 62

From past experience I notice that this error message is caused when the page has unnecessary blank spaces but I have never had it for the helper_php.php. I then decided to removed the login popup plugin and the page stopped from redirecting me to my logon.php page.

I need the iron.php page to have the login popup plugin and the email form.

The page is at buildersfence.com/iron/iron.php.
I am emailing the iron.php form.

PS: The email form works. I am able to receive emails with attachments

the error is happening because of this code which is writting the files array tothe page:
if (($_SERVER["REQUEST_METHOD"] == "POST")) {
var_dump($_FILES);
}

remove that.

The redirect is probably happening because the authenticate user server behavior in the login plugin page is set to trigger on any form post.

edit the authenticate user behavior, and set the trigger to happen on the login button being pressed.

I removed the code but I still get the logon.php page.
Is not that because I had the trigger to Button: ironFormButton pressed before I posted the tread.

I'll need to troubleshoot directly, see the private message section.

This post has been deleted.

This post has been deleted.

like i have said previously, on the myLogin/Login.php page, the Authernticate user behavior is set to trigger on Any Form Post.

Edit the authenticate user behavior on the myLogin/Login.php page to use the LogIn_submit button pressed trigger instead of any form post.