Where is the variable that defines $deadline to be able to check for "Y"?

OK, If you want to see the code, here it comes. Not sure how much it will help, tho...  

Start your code here:

add_filter('frm_validate_entry', 'validate_my_form', 20, 2);
function validate_my_form($errors, $values){
if ($values['form_id']  == 7){
	$email = wp_eMember_get_user_details("email");
	include "/home/customer/www/nepta.com/public_html/mysql_connect.php";
	$recital = $_POST['item_meta']['448'];
	

// if today is between Jan 1 and before March 2, renew date must be lastyear-0101 thru lastyear-09-30
	// If today is betweeen Oct 15 and Dec 31,t then renew date must be thisyear-0101 thru this year-09-30
	$today = date("Ymd");
	$thisyear = date("Y");
	$lastyear = $thisyear - 1;
	$JanDate = $lastyear . "-01-00";
	$OctDate = $lastyear . "-10-01";
	$JanDate2 = $thisyear . "-01-00";
	$OctDate2 = $thisyear . "-10-01";
	
// Set and check deadlines
	$dlj1 = "20221211";
	$dlj2 = "20221225";
	$dlint1 = "20230101";
	$dlint2 = "20230108";
	$dlcomjz20 = "20230115";
	$dlens = "20230305";
	$dlsen = "20230208";
	$dlfrei = "20230319";
	$dlham = "20230326";
	$dladult = "20230305";
	$dlhalloween = "20221006";
	$dlmushope = "20221023";

//Get date parms here
    $today1 = date("md");
	
	$roger = "About to call editdata";
	
include "/home/customer/www/nepta.com/public_html/members/editData.php";	
	
	// Set and Check Oversubscription

include "/home/customer/www/nepta.com/public_html/members/teacherchk.php";	
	
	
	// Return Errors 
	
	if ($deadline == "Y") { 
		$errors['deadline'] = '<strong style="font-size:1.1em;">The deadline for this application has passed</strong>';
	}
	if ($overlimit == "Y") {
		$errors['overlimit'] = '<strong style="font-size:1.1em;">You have already reached your student limit</strong>';
	}
	
} // end form id = 7
	// echo "Error: " . $errors['deadline'];
	return $errors;
}

That value is being set in editData.php.
Please note, I have already verified that $deadline is being set to "Y", and that $errors['deadline'] is indeed being populated.
Note the commented out echo line. When activated, it showed the error msg. So, I know all my code is working.
Maybe its a plugin conflict???
 
RW

Thank you for all your input. So, I deactivated the 2 snippets that were using the same function (frm_validate_entry) and it worked fine. So, now that we've narrowed down the problem, how do I activate these 2 snippets and be sure they all work? I have already shared the snippet in question. I will display the other 2 below and perhaps one of you can see my error. 

add_filter('frm_validate_entry', 'validate_username6', 20, 2);
function validate_username6($errors, $values){
if ($values['form_id']  == 6){
	$dbc = mysqli_connect (DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);
//Check connection
if (mysqli_connect_errno()) {
    echo 'Could not connect to MySQL: ' . mysqli_connect_error() ;
}
mysqli_select_db ($dbc, DB_NAME );
$memberdb = "wphq_wp_eMember_members_tbl";
	
	$user = $_POST['item_meta']['765'];
	$email = $_POST['item_meta']['173'];
	
	$check = mysqli_query($dbc,"SELECT * FROM $memberdb WHERE email = '$email'");
	$rowcount = mysqli_num_rows($check);
	if ($rowcount != 0) {// email has been found - error
		 $errors['my_error'] = 'This email already exists.';
	     return $errors;
		 }
	$check = mysqli_query($dbc,"SELECT * FROM $memberdb WHERE user_name = '$user'");
	$rowcount = mysqli_num_rows($check);
	if ($rowcount != 0) {// user name has been found - error
		 $errors['my_error'] = 'This user name already exists.';
	     return $errors;
		 }
  }

}

/* Validate email address exists  */
add_filter('frm_validate_entry', 'validate_email27', 20, 2);
function validate_email27($errors, $values){
if ($values['form_id']  == 27){
	$dbc = mysqli_connect (DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);
//Check connection
if (mysqli_connect_errno()) {
    echo 'Could not connect to MySQL: ' . mysqli_connect_error() ;
}
mysqli_select_db ($dbc, DB_NAME );
$memberdb = "wphq_wp_eMember_members_tbl";
	
//	$user = $_POST['item_meta']['741'];
	$email = $_POST['item_meta']['772'];
	
	$check = mysqli_query($dbc,"SELECT * FROM $memberdb WHERE email = '$email'");
	$rowcount = mysqli_num_rows($check);
	if ($rowcount == 0) {  // email has not been found - error
		 $errors['my_error'] = 'This email does not exist.';
	     return $errors;
		 }
  }
}

Thank you. Good suggestion...that seemed to do it.
Staging site working fine, Now I'll move to Live site.
Thanks again,
Roger

Big Thank You to Rob for his invaluble help in diagnosing and fixing this issue. I'm very glad we have this forum since the Formidable Support team offers very limited support.
When I get a chance, I will probably rewrite my other snippets similarly to this new one, thus avoiding future "conflicts".

Not sure where else to post this, but Rob sent me a perfect example:

1. add_filter('frm_validate_entry', 'my_one_badass_validation', 20, 2);
2. function my_one_badass_validation($errors, $values) {
3. switch ($values['form_id']) {
4. case 6: // validate username in form 6
5. // do stuff
6. break;
7. case 7: // validate subscription in form 7
8. // do stuff
9. break;
10. case 27: // validate email in form 27
11. // do stuff
12. break;
13. }
14.  
15. return $errors;
16. }