[SOLVED] Repeat products in eCommerce not showing...

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Right, I've put a site together incorporating the eCommerce add on, all fine apart from a couple of things... the site sells custom made hats, each hat has a number of customer choices, basically selctable colours for different areas of the hat. If I select 'Hat Model 1' (for example) choose the colour options I want and add it to cart, it all works fine, it lists the choices in the cart pop-up. However if I try and add another 'Hat Model 1' with different colour choices, it just adds another to the quantity but still lists the first set of choices. Is there a way around this? (or am I missing something obvious?!) Any help much appreciated.