Bug on mobile and tablet with interactive video

Hi guys,

I have been using the Interactive video in Moodle for several weeks and have noticed a recurring bug (I think): on certain devices or browsers the interactive video won't let me introduce the answer in a "Fill the blanks" type question on the second attempt when it is set to "Require full score before proceeding". That is, if the user has an incorrect answer and is directed a few seconds backwards in the video to listen again, when the questions pops up again the input field is blocked and the user cannot advance in the vídeo. 

It seems to work fine on Chrome on my laptop, but Chrome on my mobile and tablet have this problem.

I would send you an example but I can't seem to get guest access to the embeded content on Moodle.

EDIT: You can access the video from the course page: https://xn--espaolavanzado-tnb.com/aula/course/view.php?id=11

The first interaction is as described above.