I am just walking my first steps with H5P and I am really exhited about the possibilities. My first trial is a drag & drop question and I am just struggling about the number of results being showed at the end of the task. In my trial there are six draggables but the results never show more than five. You can try here - place 6 draggables in the dropzone and finally click "Überprüfen":
As I couldn't find any hint to this limitation anywhere in the documentation: where is my mistake?