-- HikaShop version -- : 3.1.0
-- Joomla version -- : 3.7.2
-- PHP version -- : 7.1.1
-- Browser(s) name and version -- : Firefox 53.0.3 (64-bit)
A minor problem, I was setting up a new test site with a fresh install of Joomal 3.7.2 and fresh install of current HikaShop 3.1.0. The "Popup" option of the Address Selector in Configuration > Checkout > Shipping & Payment seems to show up twice. I didn't see this problem on HikaShop 3.0.1, so I think it might be related to the new version? See screenshot.
Thanks.