If you have Multiple Hud scripts in 1 directory only 1 will load otherwise they have to be in different asset folders

did you register the HUDs with different IDs?

That's odd, it works fine for me. 2 separate overlay scripts are displaying at the same time.
I'm using Palladium-fabric-1.19.2-4.0.0.0-Pre100-fabric.

I have 2 scripts in the assets/spy_pack/kubejs_scripts folder

My scripts
vertical_bar_overlay.js

some_overlay.js

I had 2 bar overlays and they wouldn’t both load until I separated them