Conference Championship game locations severely limited

As I've started messing around with custom conferences, one error or glitch that I've come across is one I haven't seen mentioned anywhere else yet:

You only have about 5-6 stadiums that you can pick from for all of your conference championship games, and the selection is weird and random. For instance the SEC championship game is traditionally played at Mercedes-Benz stadium, but that's not even an option for me. No matter the conference my choices are Allegiant Stadium, the Holiday Bowl, Arizona's stadium and 2-3 others. 

Is this happening to anyone else, and/or has anyone found a solution to it yet?