I previously finished this course and am now reviewing but changes have been made. One of my issues is with letters that end in a’ such as Baa’ ب. Previously you could type in Baa and it would be correct, now you have to include the apostrophe or it is counted wrong.
Another issue is the correct entry for words like al-akh-baazاَلْأَخْبَاز The answer is counted wrong if you don’t include the dashes between al, akh and baaz.
I don’t think the course has changed.
I think more likely this is a symptom of a bug that has been affecting many many courses since around last Friday.