Orders are appearing in Vm but not in paypal

[ab]

Hi all

i have this odd thing, some ( not all abou 1 in every 10) are being taken by Vm but noting happens in paypal, no order,no faield order etc


any ideas
other orders are going through from VM to paypal and the user is getting the pending coformation and then the confiremed email and the status is updating

any ideas

thanks
Adam

[zanardi]

Since the user complete his/her order on Virtuemart and THEN is taken to PayPal site, i guess the most obvious reason is that he/she close the browser while PayPal site is loading or anyway before the payment on PayPal site is completed.