@Cristina,
Thanks for attaching a copy of your H5P Drag the Words content. I can confirm that it does not work as expected. It looks like your content got "corrupted" at some stage, and is missing the Behaviour settings. I notice there is a mix of Spanish and English languages in the content.json file (inside the H5P archive, which is not accessible).
Anyway I have re-used your original text in a working version of H5P Drag the Words, and am attaching it to my reply. Please check that it works on your Moodle site.
If there aren't too many H5P Drag the Words contents that have the same problem, you can easily edit them, copy the Text field, paste it inside the Text field of a newly created content, and save.
Hope that helps.