+1 from gpink and conrad.... You need to get the battery out of the bike, see what the voltage is, and see if it will charge to green by itself to determine if the problem is withe the bike putting a drain on the battery...
Well, you don't have to take it off the bike (or disconnect it) to check the resting voltage condition. Just charge the bike "fully" (or as much as it will take), start the bike, turn it off, wait 5 min, and take a reading anywhere accessible, but WITH THE IGNITION AND ALL LIGHTS OFF.
If you want to test if the bike is putting a parasitic resting drain on the battery, the only way to test that is to use a multimeter on milliamps setting, make sure bike IS OFF, disconnect one pole of the battery, then connect one lead of the meter to the disconnected battery pole and the other to the disconnected bike lead. This will show the current drain. It
should be extremely low, like in the 10mA range or less (I don't know exactly what the maximum would be considered acceptable on the Concours).
I do know when I ride it says 14.3.
As gpink said, the voltage reading from the display is mostly meaningless. That is the condition of the battery PLUS the alternator PLUS the voltage regulator in the alternator vs. all the current load from everything sucking power. Think of is as an "overall health of the RUNNING electrical system". But that reading says almost nothing about the condition of just the battery, alone.