I have had this same issue.
Some of the responses were interpreted correctly but others were misspelled versions of what I said such as:
Juliette instead of Juliet
Kelo instead of Kilo
Etc...
This was when using VATUSA from my phone and happened on or around 21 March 2022.
Fyi for the website team that helps with the training content.
Nice work all in all so far though!
None of the answers work in 1. ATC Basics/1.2. Communication/Practice the Phonetic Alphabet Speak Aloud.
It seems it translates the phonetic alphabet to letters, but the answer is looking for the phonetic names.