Attendance duration is not reporting correctly

Hello,

I recently recorded a meeting with several attendants that lasted ~30 mins. When viewing the attendance report, the duration of most of the attendees did not record correctly. I am sure of this because I had some discussion with some of them late in the meeting. The time recorded was 1 - 5 mins (depending on the attendee). One of these attendees is recorded 30 mins into the meeting asking a question, yet the report says she only attended for 5 mins. 

Please advise. 

Thank you!

KBJ