'Special Grenade' counter HUD won't work and I have no idea why, theoretically it should...

Hi, in my HUD I have 4 slots, and each one is filled with the icon for my ‘special grenade’ item (Disk Drone), but I want the icon to be transparent when it’s not in your inventory. I’ve used a print string in this widget blueprint after the ‘get Disk Drones In Inventory’ node, and it showed the correct value, but all 4 icons are invisible at all times. I’ve checked to make sure they’re not transparent by default, and I’m genuinely at a loss, I don’t see where I’ve gone wrong, so any help would be appreciated, thanks!

This really shouldn’t be a hard blueprint to make, so I’m guessing it’s something stupid that I’m missing, but I can’t figure it out