Variants causing products to error in cart

-- url of the page with the problem -- : midwestmeats.com.au
-- HikaShop version -- : 2.3.0
-- Joomla version -- : 3.2.3
-- PHP version -- : 5.3.10
-- Browser(s) name and version -- : XXXXX x.x.x
-- Error-message(debug-mod must be tuned on) -- : Error_message
Since loading warehouse options to give great flexibility to shipping methods, our products with variants are causing orders to fail at checkout.
Carts look ok on front end, but back end they differ, usually defaulting to a zero balance or saying not enough stock, when there are no restrictions on the amount of stock. In some instances the product titles merge in error. Customer would have no idea why their order is not processing.
We individually loaded warehouse, product title and amount $ of product into each variant, but still did not solve issue.
Before having warehouse options on site the product - characteristic - variant worked well.
Our variants do not differ the product price, they are there to add options for the consumer eg. Leg of Lamb = Variant is (1) Bone In (2) Bone Out. They are very simple in nature. The variants even have same shipping method as product.