[JRTJH]

Do you mean that the lables (stickers) on the side of the RV indicate that the black releases the gray contents and vice versa? or do you mean that when you pull the black tank valve, the gray status indicator lights on the inside information panel indicate the gray tank is empty and the black tank is still full?

If it's the stickers on the side of your RV that are labled wrong, that's been a Keystone issue for at least the past 5 years. Either pull the stickers off, or if you're really intent on having the stickers on your RV, then contact the dealer to get new stickers. Usually, once you pull them off, they won't stick again and stay in place.

If it's the status indicators, then the tanks are probably wired wrong (reversed wiring). The easiest way to fix that is to rewire the status panel. If you're not familiar with electrical/electronic wiring it might be best to leave that task to the dealer or to someone who is competent to do the job for you.