Highlight Items Only While Player is Overlapping Items Collision

I followed this tutorial (https://www.youtube.com/watch?v=rGqlReFObYQ) to set up a highlight/outline effect (via post processing and render custom depth) for my items which are interactive. I only want them to highlight while the player is within range of interaction, which I would assume would be when the player overlaps the items sphere collision component

The items are outlined all the time, no matter what. Is there a reason why this isnt working, and how can I fix this? The following blueprint code is on my item parent class.