Paypal ipn issue

Ok whats even weirder about this is, I used a wrong email address by mistake for payment to Paypal (typed it wrong) when i got this completed pending approval. The payment was done but not to an account (on hold as such in paypal) but it made the site recognise the transaction at least. Changing it back to a confirmed paypal email address Im getting the same as before. This makes me think very much its got to be the way paypal are sending the information of a completed transaction thats changed.

One thing i have noticed is that item number isn't being filled or returned from paypal. Could this be the issue maybe?

// assign posted variables to local variables
$item_name = $_POST['item_name'];
$item_number = $_POST['item_number'];
$payment_status = $_POST['payment_status'];
$payment_amount = $_POST['mc_gross'];
$payment_currency = $_POST['mc_currency'];
$txn_id = $_POST['txn_id'];
$receiver_email = $_POST['receiver_email'];
$payer_email = $_POST['payer_email'];
$ordID = trim(@$_POST['custom']);
$mc_gross = @$_POST['mc_gross'];

paypal.php file

Ok and just like that .. it works again. So must have been Paypal all along who changed something.

still happens from time to time .. which really bugs me. Any one else have this issue?