I, too, was shocked by my results. I know my family came from England, Ireland, Scottland, Wales and Germany. My results came back as 82% Scandinavian and 18% Southern European. I know the Vikings raided many lands and took over.
Interestingly enough, when I was able to trace my roots back to certain parts of England and read the history, the first written records show they were being ruled by Vikings at the time from Denmark.
I have no idea where the Southern European (Italy, Portugal, Spain) comes in. I don't know of anybody on either side who came from any of those countries.