did I do something wrong in the set up? I have many blanks on this type of question/response.
Users are a crafty bunch of individuals. It is easy to circumvent this field – a hit on the space bar is enough to satisfy the the write-in requirement.
For future projects you might want to consider creating a conditional followup question instead of using the OTHER -WRITE-IN option. If the respondent selects the OTHER option, a conditional ESSAY/LONG ANSWER question appears that asks for details. You can define a minimum number of words or characters in this type of question, so it is harder to blow off.