International transactions. And since they're in Yen, it's causing even more problems. Banks are flagging these as suspicious transactions left and right, but the issue is solvable by the pledgers if they contact their banks.
Also, there are only 220 pledges that haven't gone through left, which guarantees two of the stretch goals. With backerkit and new paypal purchases, along with those of the 220 left that will fix the pledge issue, it is likely that the 3rd stretch goal will be met either way.