It sounds like there is some confusion over the difference between a user's role and the permissions that user has been granted. User roles dictate which permissions can be assigned to a particular user. Permissions control access to Checkbox entities. Simply being assigned an Administrator role does not grant a user any additional permission (with the exception of System Administrator) over an entity. By default a user has access to only the entities they have created, be that a survey, a report, a user groups, etc.
Checkbox Survey is a powerful, flexible, and easy to use online survey tool. It's used by companies around the globe for creating professional surveys, questionnaires, forms, polls, and more. Available hosted or installable.