Multishot not working Correctly with KB of Clustering?

Hey guys,

I have allocated Multishot but on the character sheet details it says KB fires only 1 projectile, and in game, it does fire only 1 projectile. Do you know why this does not work?

this is how it looks like: https://imgur.com/a/spuHEKL


if you know why this is happening, please help, it is much appreciated :D