Good concepts but a few issues.
1. Using capitalized words for some clues and all caps for some makes it easy to spot the group.
2. Seems like you are being very strict with the accepted answers. For e.g., for the NATO alphabet group, I assume the accepted answer you put in was "NATO Phonetic alphabets" which makes it try to match the full text. You could instead put the text as "NATO, alphabet, phon" and it would match for NATO, phonetic, alphabet, and any combination thereof. Also make sure that you don't add a comma at the end, that would make it accept any answer including blank.

The Loved the Petunia group, tho had only.heard of 2 of them... otherwise as the excellent feedback below