This has just happened to me, on an automatic payment PayPal ignored by primary payment method and chose a credit card that was not my backup. The payment went through however it was my corporate card which means I now have to pay my company back for the transaction and try and explain the error of why the company card was used for a PayPal transaction!!! There is no category on the help section to flag this up and I am now quite nervous about what payment sources PayPal will decide to use in the future. Did you get any answers why it happened to you? I also cannot find a way to set the default backup source for automatic payments. Does anyone know how to do this?
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