Hi,
This display is made because you're using the "bootstrap design" in HikaShop and your template is providing this display.
So you can remove the "bootstrap design" option in HikaShop or tweak your template in order to change the look of these elements.
But it's not something related to HikaShop, the code used is the same than in Joomla 3 login page.
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.