Report clarification needed

Is this a bug that in report for user A1, I see different quantity of translated words and target language words, and for user B2, I see exactly the same numbers for both these sections. What’s the difference between them and why they are similar to 1 user and different to 2 user?

Target language words = number of words in the target language
Translated words = number of translated source words

If you translate “hello” as “hello hello”, report will display 2 words for Target language words and 1 word in Translated words