Drag and Drop Slide: Drag-Element is locked on revisit

Hi all,

Storyline3: I have a quiz with drag and drop slides. I want the slides to be answered correctly. If not, the learner has on the result slide a button "restart".
This button just links to a menu slide.

The learner should then revisit these drag and drop slides, they should have the initial state and he could try again.

This repeating process should last as long as the result is 100%, where the learner can exit the course.

But on revisit the drag&drop item is locked on each slide. Its on the initial position, BUT I can´t move it. I tried all slide-properties (inital state, saved state), but no change.

The only working thing is to let restart the course with a button, but I dont want that.

Any Idea?

Thorsten