Hi,
The order listing display the "main" orders (the HikaShop customer orders) and not the "sub orders" (HikaMarket vendor orders).
In one order, you might have several products from several vendors ; that's why HikaMarket creates these subsales.
And that's also why there is no vendor attached to a "main order" ; because the vendor do not own that order, it owns the sub sale which only contains his specific content.
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.