This is interesting, but also a little confusing.
To clarify when you go into the products with attributes entry form you see one set of attributes, but when you submit values it creates two database entries which are then displayed (presumably in the overall listing).
Now you are adding that Internet Explorer (you don't say which version) only displays one of those two entries for the same variant.
Clearly this is not normal behaviour for the mod or many other people would have been concerned about it, and I can't reproduce it in my test environments. My recommended lines of investigation would be 1) to check that none of your files have been corrupted by downloading the ones on your server and comparing them to a fresh download of the mod and 2) to ensure that there is not a problem with how your attributes have been set up.
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