What Coach is trying to say, despite his difficulties on writing in English, is... It was not a 24 second violation but it was the end of the period. So, it was not a serious bug, just a wrong choice on the line. It should simply have shown "End of the Period".
But, your "End of the Period" was different than most... Because, you were able to make a substitution. Don't know why the Engine did it at that moment and not in the beginning of the Overtime.