Draggableviews: Field collection item double entries

I use Field Collection and a Standard Master Field Collection View do display the fields the way i want to...
In the View I added a Draggableviews: Field collection item (Field collection item) and changed the sort criteria to Draggableviews: Weight (asc) (New items appear bottom of the list).

First everything works and I was very happy ;)
but some klicks later I realized that the view displays double entries in the view...
Some Field Collection Items are displayed double, triple, quadruple...

Is there a trick, doing something wrong?

thx for help.
Do you need more Informations?