my buyers are having problems with making multiple purchases

I have had at least three regular buyers send  me a message stating that they can not purchase several cards at the same time like they use to, - one customer two days ago had to purchase each card  separately and pay as it would not allow him to use the check out  note: I usually combined the purchases  once they have selected 15 or so cards) however i have had to provide over 10 refunds on the shipping for one customer, now tonight i have another customer which said he selected 10 cards but when i check my ebay page nothing was there could some one please contact me to find out what this issue may be, note some buyers are not having any problems with selecting cards  and requesting a combined invoice. Thanks barb 

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my buyers are having problems with making multiple purchases

could you possibly have pay right away on some buy it ?

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my buyers are having problems with making multiple purchases

Hi, all my listings in my store have a 7 day payment option,
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