I am working on a resourcepack and I just started with 3D modeling.
I created a model for the normal torch. What happens is that the model for the normal torch overides the redstone torch aswell now. If I make it for the redstone torch the normal torch would get the model from the redstone torch aswell. The issue is able to be fixed if there was a seperate file for the torch and the redstone torch. In default the textures from the torch and redstone have the same shape, while in resourcepacks, like mine, can have different texture shapes.
I hope I explained it clear enough. If there are any questions you can ask me.