Children timed out as soon as they log in the next morning

Computer: Windows 10.

My son was playing games last night and was locked out as expected at 8:45PM. He normally has a 2 hour allowance, but I extended his time by half an hour. No problems there.

The following morning around 8:00AM, he logged in to print out some homework. Norton kept throwing up the one minute warning and timed him out over and over. I also received the following warning via email:

(Name) has reached his daily time limit of 2 hour(s). (Computer name) was automatically locked.

It seems that Norton combined last night’s​ activity with this morning’s activity. Why does it not separate the two?