I have had people tell me they have done the survey but it has not seemed to update.
Have you tried confirming this – i.e. have you taken the survey via the survey link to confirm if the response is showing up under Results > Individual Responses?
Testing in this way might help determine whether there is a problem.
Yes, I have done a test and it showed up, and one has show up since I posted, but not as many as have said they did it.