we are not sure about what you mean....
But if you tell us that you receive (or have received) unemployment benefits while at the same time have paid fulltime work, then this is not legal, and you have to pay back what you have received in benefits.
Please also notice that www.a-kasser.dk is not an A-kasse, we only compare the different A-kasser.
So maybe your question should have been sent to your A-kasse.
Please feel free to answer this post, if you have further question.