Some objects are not rendering on Mobile (Material black)

Hello Everyone,
I seem to have a very annoying problem when I package my game for mobile that I can’t seem to understand. Some of the objects shows black, like it’s just an outline of where the object should be. The image that I’ve attached shows what I am talking about. The materials that I use on the objects that show black are the exact same materials that I use for other objects in the same scene and those ones show. However, everything shows fine when I play in editor. Does anyone know what might be causing this?