how to amend postage when buying multiple items

I wish to buy multiple items of identical articles and seller has stated $8.50 for 1st item and 50c each additional.  I would like to buy 7 but as I procede through the buying process, the postage still comes to $22 which is not what my arithmatic makes it.  Shouldn,t the total be $11.?        I recently vastly overpaid postage and seller said that was my fault so am being more cautious now.  It was not this member. 

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