Hope he doesn't mind. Im going to copy/paste reply from Josh. Thanks again for your response!
This has been going on a long time now, and seems to take place on every band. I suppose what is happening in some cases is the gov officials/engineers who supervise the broadcasts decide for themselves to move out of band so they have a clear channel so to speak. These same guys are also often the reason a station is 10kHz wide or more instead of 6kHz like they should for hfbc
Since hfbc is on a 5kHz slot, modulation splash is often a problem between adjacent broadcasts, as well as having the stronger of two nearby signals grabbing and holding the agc level of a given receiver, reducing the audio power of the lower signal strength sig.
Also consider if the broadcaster has had equipment for such and such a frequency for a long time and then the itu moves the band so their equipment is now out of band, instead of a possibly costly retuning they they say screw it and continue using the freq.
Then there's countries that do as they please, China, North Korea, Iran, etc that take a dim view of itu regulations even while members of itu and fire up jammers and broadcasts wherever they please.
It's not like the itu or un will do anything.
Just some thoughts on an interesting subject, thanks for the question.