Why do only some of my inventory slots have the hover image?

I am trying to create an inventory ui in unreal. There are 5 columns of slots but the hover image doesn’t show up if I hover my cursor over any slots in the left two columns. It happens when my mouse crosses a specific pixel on the screen. If I make the inventory smaller, I can hover and click on any button as long as it’s on the right side of the screen. However, if my inventory is in the middle or left side of the screen, I cannot get the hover image to show for any of the slots. How can I make all of the slots show a hover image regardless of its location on the screen?