You don't have any live listings showing.
It may be that when your listing is live and showing on the site that the postage will be correct.
I listed a few things yesterday and when I looked at them and checked before listing, the postage was wrong - even after I corrected it.
However, when the listings went live, the postage was correct and what I wanted it to be.
So, wait until your listings are live then check them and change if necessary.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)
