Hi,
step-0 and step-1 are not the same.
When you submit the checkout form, you will see the URL for the next step but depending the content submitted, HikaShop can force the step to be still the previous one ; specially if some data changed or if some elements are missing.
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.