Quality Game Settings Menu, a good looking UI ready for use

That might happen since you cast to “FirstPersonCharacter” in one node sequence, and using its values in a different node sequence.
The event construct sequence needs its own node “Cast To FirstPersonCharacter”. Its not good design to grab settings menu from the OnClicked Sequence, since they are not related. Remove the delay node.

Try to reorder your nodes.

Some features with live feedback don’t work if the game is paused.

Edit:
I will look into this in the future and make it easier to add settings menu to your own menu.