The reason why you are getting a prompt to click "Continue" on the Differences dialog window whenever differences are found is because you are running in Attended/Manual mode. To prevent prompting, you can either configure the Group to run in Unattended mode (by setting a Schedule for it, for example) or you can disable the Differences window from showing up in future runs.
More info here:
http://support.2brightsparks.com/knowledgebase/articles/229457-stopping-differences-window-prompt
http://support.2brightsparks.com/knowledgebase/articles/213806-background-scheduling-and-running
http://support.2brightsparks.com/knowledgebase/articles/214250-situations-under-which-a-profile-can-be-run
More info here:
http://support.2brightsparks.com/knowledgebase/articles/229457-stopping-differences-window-prompt
http://support.2brightsparks.com/knowledgebase/articles/213806-background-scheduling-and-running
http://support.2brightsparks.com/knowledgebase/articles/214250-situations-under-which-a-profile-can-be-run