Problem of the basket

[vipera]

Hi,

 

When a customer put in the basket different colors of the same product, in the basket increases the amount of color which the customer chose for the first time, for example, when somebody buys the shadows number one, two, three in the basket appears three items which have number one instead of three various products. Can you tell me how I can solve this problem?

 

Thanks in advance for your help.