Speak the words Set

I have created a couple of these exercises, then embeded them into my web and they do not appear when loading the site. Nothing shows instead, not an error message or anything. As if I never created the exercises to begin with, but they load (sometimes) in my H5P library. It is only happening with this specific activity. Any suggestions? Thanks!

Speak the word Set doesn't allow me to write words with accent in the solutions. I mean, if I write, for example, "¿Qué hora es?", and pronounce correctly, it will say "incorrect". It will offer these "correct" options:

I find this app extraordinarily relevant for my classes, but I can not teach my students incorrectly written words without accent. I have seen that the accent does work on this example:

https://h5p.org/speak-the-words-set

What am I doing wrong?

Thanks!