Can't scale image to widget

Hello!

I’m currently having trouble trying to scale an image to fit inside my “InventorySlot” Widget. The image won’t scale properly to fit inside the widget, even if I use a scale box or size box and then place the image inside of it.

Here’s the widget

https://i.imgur.com/MFoFB7x.png

Here’s it in-game without the image set to anything yet

https://i.imgur.com/0WIi7oq.png

And here’s what happens once the image is set to something

https://i.imgur.com/DmnijtR.png