Hi,
That's because in the user account plugin settings, you need to enter the id of a menu item on which you want the profile edition page to display as it can't stay on the current menu item. The best would be to have a menu item of com_users profile created as a hidden menu item so that you could it its id there.
That's because the control panel is a HikaShop page and thus the current menu item is a HikaShop menu item, while the profile edition page is a com_users page and thus should display with a com_users menu item.