Hi,
For the import warning message we made a fix and we update the package.
You can re-download HikaShop starter and the "duplicate columns" message won't show it anymore.
After that, if you have other message that these "duplicate columns", it will be helpful to understand what went wrong during your import.
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.