There are no records in Responses with a value of "no" in the Responded field. There are a few that have " No", but you are working with a machine and "no" and " No" are entirely different things to it.
Look very closely at the characters I put in quote marks above. Don't just stop at the capitalization differences--one of them has 2 characters between quotes, the other 3. That's where you went wrong.
Well, actually storing that data in a text field is where you went wrong. There is a Yes/No datatype in Access that you probably should have used for the Responded field.