Its just a little bit of extra special effect to make them more scary - to have them behave differently then just ordinary humans or humanoids or other less special creatures. They are basically giants when compared to our characters. Monster giants. Down in the Underdark where things are extra weird. It fits.
The game is not direct transcription of DnD rules.
Hook Horrors also jump a very similar distance. These are special monsters.
There really is no need to go into this kind of overblown screaming about it.
Last edited by Surface R; 28/10/20 05:51 PM.