NBT Tags aren't working properly for me.

So I have a boolean variable that used to be triggered with global variables. The variable would turn on an overlay and would grant the player with small perks. I changed the global variable to an NBT tag so that it would only effect the player who triggers the variable, but now nothing works. The overlay doesn't turn on and half of the perks don't activate. I've made sure that everything that the global variable was connected to was connected to the NBT tag, but it still just doesn't work and I have no idea why it's not working. The same thing happens with my integer variable. Please help.