Inventory Items not showing up in standalone game

i am work on inventory system, when i came across some bug. in editor works fine. but in standalone, items wont show up in the inventory. its probably the editor. i am using 4.23.0.

i follow this Tutorial on inventory system Unreal Engine 4 Tutorial - Inventory System - Part 1 - Setting Up - YouTube

I have the same problem :frowning:
Is the problem resolved?