Aiyo it is well known that Grab clock is slow by 25 sec.
And also Grab calculates based on the rider request time, not the time you accept the trip request.

Example passenger starts request at 5:59:40.
3 drivers ignored the request, then the 4th request come to you, when you accept sure the trip will be count at 5.59. Even tough the time you accept, the clock already passing 6.00.

Hope you understand.