I found another couple things in Lesson 7.7.
In Write It, the program says the correct spelling of this sentence is:
Sie hat das Abitur neunzehnthundert-neunundneunzig gemacht.
Notice it puts a "T" in the middle of neunzehnhundert that doesn't, to my understanding, belong.
Also in this lesson & others that include numbers, the program often transcribes a spoken number as a numeral, but counts it as wrong because it is expecting a written number. E.G, "1989" instead of "neunzehnhundert-neunundneunzig" or "am 28. Dezember 1975" instead of "am achtundzwanzigsten Dezember neunzehnhundert-fünfundsiebzig." If the program has the capability, it would be more user-friendly if it counted both the numeral and written number as correct.