Increase Number of Items in Widget

So I have a small system with Glowsticks, where I press a key and a glowstick falls. That causes my Inventory with a glowstick counter, to count down one.
Now I want to be able to pick back up the glowsticks and have the number increase. I’ve been messing around with it, but I can’t seem to be able to get it to work.
(I got quite a few pictures, bear with me)

(The menu with the glowstick counter^)