With a character size of 1.8m :
My 17 strength gith barbarian can jump 7.7m horizontally, RAW says he can only jump for 5.1m with a running start and 2.4m without one.
Gayle has 9 strength and can jump 4.7m horizontally, RAW says he can only jump for 2,7m with a running start and 1.2m without one.

So distances aren't respected according to the DnD rules. My guess is that it is a compromise for level design, so that our characters can jump larger gaps scattered around the map.