Hi,
When you edit an address in that page, it opens a popup.
In the checkout we have new ways to edit addresses, that we will include in the other page in a future release.
For me your problem is really link to the popup system and your template. You have to check which popup system is working in your front-end website and/or fix your template to make it work correctly.
For the duplication in the checkout page, we will investigate on it.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.