Drag and drop : 30 labels correctly placed but score is 30/33
I am using H5P (latest version, all libraries updated today) with WPplugin (last version) on Wordpress (last version).
I have created a drag and drop activity which consists in drag-and-dropping 30 words in 6 boxes. I've tested the content and got the 30 words correctly placed in the 6 boxes. There is no labels left to be placed, as shows the screenshot attached.
Still my score is 30/33 although it should be 30/30, right ?
So I've edited the activity to check again where could be my mistake. I didn't add nor remove any label. But now, when I complete the task correctly, my score is 30/35 (but there are still only 30 labels to place - see screenshot attached). And when I edit the activity, everything is messed up : the labels are not the same that the ones I checked when I saved the activity. I have to re-check every label and dropzones again.
Usually my drag and drop activities work fine. What could explain such a strange behavior ? I attach the H5P activity so you can have a look and maybe point out a direction.
Thanks for your help !