Time limits only register 1/2 of the accual time used

The time limitation set of each of our looked after children and grandchildren are set for 1 hour a day with the commanded to log of when reached.  I have notice that the actual time is registered on the reports is 1/2 of the time spent enabling them to stay on for 2 hours.  I have checked all the settings and can't see any thing wrong.

Each Child has 1 hour a day between 9am and 6PM.  We now have to monitor the usage manually.

Any help please  !!!!