not sure what you are referring to specifically, but the hoods are often having to be repainted for heat damage from the prime mover catching fire (GE trademark). the A/C units are changed out rather often, and sometimes a matching replacement is not available so they get one that comes off a differently painted unit. it is actually more often that an orange one gets put on the warbonnet colored locomotives than the other way around, because there are many more orange ones.
i am not sure what happened exactly, but somewhere between my putting the warbonnet A/C and making a slight update to the files on the site that change got lost somewhere. ill get this fixed probably when the NS dash 9s hit the site.