Users able to edit jobs and scripts

So I have my support group locked down so they can run tasks on computer but not edit them. However, some way some how they are still able to edit scripts and add tasks to jobs.

When I log in with my limited account I am unable to do any of those changes. Once thing I did notice is that it says the scripts have been edited by the service account.

Does anyone have any idea how they are doing it or why the service account is listed as the one that made the change.

I did just change the service account name and password so I know they do not have that account.