eBay Voucher Glitch

Interesting thing happen today while using a voucher from ebay for a new account $20 off min $30.
So had $30 in cart (about 5 items), put in the voucher and login to paypal account with $1 balance and expired CC (didn't realise this).
Anyways when it was done with paypal if appears only one of the cheap items went through ($2.60) paid $0.86 and the rest shows as voucher payment. But when i checked my ebay account the $20 off voucher was still there. So put everything back and did it again with an updated CC in paypal.

Just though it's interesting so essentially got additional discount on the $2.60 item. I'm pretty show it'll stand as the payment has gone thorugh and it shows under purchase in my ebay account.

Wondering if anyone has come across this?

Will test further if I get another voucher from ebay, not sure where the cut off would be, so effectively could get discount on more then offered, ie $40 off $60 spend if you have more stuff you want to buy that is. for example use the voucher with $30 but only have $15 in paypal and get the discount (it was the last item i put in my cart which went through) but still have the voucher to use again and again possibly!!??