2 entries in product list for each product

Why does hika shop admin create 2 entries in product list for each product, even though only 1 shows up on the public web site?

I've never heard about that.
Can you do a screenshot ?

Here is screenshot.

These are not duplicate products. They are actually the same products but displayed twice in the listing. I don't know why you have that though as we don't but it's just a query which is not done as it should in your case.
As we cannot reproduce the problem on our end, it's are to say what could be done to avoid that.
Did you change the filters at the top of the listing ?

No I did not change the filters at the top of the listing. Any other ideas as to why it happens?

I don't know really...We would need to be able to reproduce the problem in order to understand why this is happening.