Hi,
I just created a test survey in 3.6.2.
Entered a few responses and got this in the statistics page:
and this statistic result:
Well, now I changed one answer option in phpMyAdmin in table [lime_prefix]_answers:
and entered again a few responses in this question
In the statistics page I saw the following:
So, unfortunately I could not reproduce.
So probably the person destroyed a bit more than only editing a text.
Best regards
Joffm