I think it is a Google CheckOut thing… What ever the default card on Google Checkout is, will be used. This is the same behavior as Pay Pal. Google bills to a Google Checkout account, not your card. The Check out bills which ever card is set to default.
If you need to control this set the billing admin to a unique mail address tied to only one card.
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I've contacted google checkout but like all google customer support it sucks so far and they are no help.