I suspect this is explained by the concept of “moving time”. 
Your run was exactly 5k and I expect the time from start to end of the activity was 24:40.

However, Strava also calculates the time you were actually moving; this excludes time “standing still” (I don’t know if this is zero speed or below a certain speed).

If you ran all the way, you might find that the stationary bit is at the start of the activity (if this was a race you might have started recording, then stood for 2 mins before actually being able to move). If this is the case “cropping” the bit of the activity you were stationary should (I think!) give you the correct (and better) 5k time. BE CAREFUL, CROPPING CAN’T BE UNDONE UNLESS YOU’VE  GOT A BACKUP .GPX!!! If you crop too much it will be less than 5k!

@LB1995 - Segment times and best efforts are generally calculated from elapsed time rather than moving time.  So, if you had a period where you were stopped, either at the start, end or somewhere in the middle of the activity, the elapsed time will be longer than the moving time which will result in the kind of thing you are seeing.