Hi lamepenguincards, thanks for your post.
Is it possible that you haven't opted out of Simple Delivery? Simple Delivery is a default option that sets postage automatically for you, in order for you to enter the postage options of your preference you need to disable/opt out of Simple Delivery during the listing flow of your item. Just take a quick look there, and if that's not the case, please let me know and I will be happy to take a further look for you.
Thank you,
Marco
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