Mandala's GUI textures the crosshair differently from vanilla's. This resourcepack is a patch to reintroduce the vanilla crosshair.
Installation
Just put the downloaded resourepack in your C:\Users\username\AppData\Roaming.minecraft\resourcepacks
MAKE SURE THIS RESOUREPACK IS HIGHEST PRIORITY (Make sure it is at the top)
You can get to this folder by going in game, settings, resourepacks, and hit open resourepack folder. Just put this folder in and voila this amazing pack will work.