Correct answers marked as wrong in fill-in the gaps
From time to time, answers that are correct are marked as wrong in "fill in the blanks". This only happens to some of the students some of the time.
We have tried to reproduce the error, but with no success. We are completely clueless as to why this happens.
This is what it looks like:
This particular task is here: https://ntnu.h5p.com/content/129126031534812573
However, it seems to happen in other tasks as well.
This is very confusing, and I would be very grateful for any help.
Thanks in advance,