You will have to contact Ebay Customer services to ask why.
Before you do this, check the postage policy that you applied when you created the listing.
Using 'sell similar' is the easiest way to see all of the details from your original listing.
"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)