Proof Of Play Not Correct Time

Good Day All,

i have question

we have test export report proof of play 1 of our display with filter date when this display offline,

and the result report success, although this unit offline log report still collect on internal storage and store to server when display back to online.

but when i check on the document the start to end time not match with duration of media

the question is, where the issue from?,
and how to solve?, its because display offline and the log just pool count of media?,

thank you all