Any time that has been tracked on a job but not against a specific item on that job will show up as "Extra hours tracked" :
If necessary you can click through to "USED/PLANNED" and view these hours in detail:
From that resulting list of time entries you can click through to any specific time entry and if necessary assign that time entry to one of the items on the job:
Alternatively if you want to find all jobs that contain "Additional Hours" you can go to the Job List screen and click through to the Time tab and they will all be there:
Clicking on the Job Name from this list will take you into that job quickly if you need to view or edit these hours in any way.