Widgets lost when changing to Napoli-Theme

Hi,

yesterday we changed theme from Omega to Napoli, but all widgets have been lost and had to be created new. It was the first time we changed theme and don’t know if it is normal that all widgets are lost, or if it was a mistake we made or a mistake importing widgets from the theme. We created widgets new but for the future it would be helpful to know if this problem is normal for all themes or it we made a mistake.

With best regards,
lieblingsrezepte

http://www.martinas-lieblingsrezepte.de