I have a load of listings, all showing postage at £1.30. I usually send a paypal money request to my buyers, however recently I've had 4 buyers over the space of the past 6 weeks who have all bought via buy it now, and every one of them has sent my payment through with postage marked as being 50p. Has anyone else had any problems with this? I find I'm having to return their payments, explain their error and ask for them to pay again, as if I just ask for the additional money Paypal take another charge from me.