I'm a little confused about Shopify's calculated postage rates. I routinely sell to customers around the world, and specifically my orders to Australia and Canada lately have been charging the buyers high calculated shipping fees, but when I purchase the labels the fee I pay is much less. This is for first class international shipping, and I don't have any special settings on that in my settings,. For example, I had a purchase from a customer in Canada today, and they had to pay $39 in shipping, but when I bought the label it only cost me $22.
At first I thought it might be a currency conversion thing, but I double checked and Shopify is indeed paying out the $39 to me in US dollars, so that isn't it. Any ideas on what is going on?