What might allow students to work past their set time limit in New Quizzes Moderation?

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I have a student who was given additional time on an exam in New Quizzes -- time their instructors did not set for them. While the rest of their classmates who received the same 'time multiplied by 1.5' extension were given one hour to take the exam, and this is the time reflected in the Assessment Settings section of their Moderate page, the time column shows that they took eight additional minutes. (See photo below in yellow highlighted areas; names and scores removed for privacy.)

extended time.png


While she only went over by 8 minutes, the instructors tell me the total additional time she was given was 15 minutes, and they don't know where it came from. 

Does anyone know how this might have happened, and what can be done to prevent it? Thanks in advance!