You can edit the surveys that have issues, changing the answers you need to. You can edit the survey answers on your device because you were the data collector signed-in. If you need to edit surveys and you are not the data collector associated with those surveys, you will need to contact your Project Manager. Your Project Manager has the permissions to edit all surveys collected in the Cadasta Platform.
Another user asked a related question here. Please see the associated answer for further clarification.