Issue with billboards conflicting with each-other

I’m trying to make a pickup base that spawns a pickup. I’ve got it so that I can select a number of different pickups and it will display a billboard with a different image for each. Unfortunately, I have an issue where if multiple pickups are visible at any one time one of the billboards will have the other drawn on top of it (see video). Has anyone else encountered this? I guess I could use meshes but I want the 2D effect.