New to Shopify. We are using only Paypal as our payment gateway. At checkout a buyer can either purchase immediately by clicking the yellow Paypal Express checkout button or add the product to the cart. We are having a weird issue that when buyers follow the yellow button checkout route some are told that shipping to their country is not allowed. I say some because it works for buyers from North America but not for buyers from, say, South Africa. What makes it especially weird is that if the buyer follows the standard checkout procedure ie. doesn't click the yellow Paypal Express button, the checkout procedure works perfectly, no matter where in the world they are from.