I was looking to see how many people had participated and saw there were about 63 and I toggled over to see what town people were from the details and when I arrowed back it said particpants zero.
Where were you viewing these responses originally? Was it maybe within a Standard Report?
If so, the report may have been re-loading when you navigated back to the page. Are you still seeing this problem?
If so, perhaps you can elaborate on where/how you are viewing the data – other Community users may have some better suggestions at that point.
I hope this helps!