Shipped address is fixed and it is mine

-- HikaShop version -- : 3.5.0
-- Joomla version -- : 3.6.5
-- PHP version -- : 5.6

Why in checkout it is possibile to add the Billing address but the Shipping address is always my address?

I displayed my shop address but my address should serve only for write bills. In that form, an user should add his own address, instead I see my address without any possibility to make change