notify - shipping per vendor not work properly

-- url of the page with the problem -- : benefit.in.ua
-- HikaShop version -- : 2.3.5
-- HikaMarket version -- : 1.4.4
-- Joomla version -- : 2.5.28
-- PHP version -- : 5..4.26

Hi
some time ago I configured hikamarket to shipping per vendor but today check one issue in this option. when user add product from Vendor1 and Vendor2 he receive in both times Successfully product add in cart but in cart present only product from first added vendor. I checked your demo site and have same config BUT last option Configuration of plugins by vendors not present in my version i dont know this bug or option was added some time later

How to fix that problem with notify message ?
PS some of this message VENDOR_CART_PRODUCT_REFUSED/VENDOR_CART_PRODUCT_REFUSED2 not show

now when user add product from 2nd vendor he see message - product was add to cart . in config set user can add products from one vendor (LIMIT_VENDORS_IN_CART - one vendor) if he try add products from another(s) vendors he must see warning - Can't add product "%s" of vendor %s (like on your demo site) but on my site no this warning message, I need fix that.

for example benefit.in.ua/auto-moto/avtooborudovanie/product/351-fz-500
and benefit.in.ua/product/38-zashchitnaya-plenka-dlya-psp

ok good