Hi,
It will happen only if you are asking a previous page which got a form validation.
Some kind of "tricks" exist but it will be complicated to integrate that into HikaShop just with some overrides, it will affect the core if you want to use this kind of "post redirect" (like Kunenea do, for example).
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.