Ran into a bug issued by a client where some of his customers reported that IE8 adds the wrong product quantity to the shopping cart.

After doing a little Googling I found that this resolves the issue for IE8 users:

Open the template yourdesign/template/catalog/product/view/addToCart.phtml

and replace
<input … onclick=”productAddToCartForm.submit()” type=”text” />

with

<input … onclick=”productAddToCartForm.submit(); return false;” type=”text” />

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