Nuki Binding - Problem with second Smart Lock on one Bridge

I am new to openhab2.
Running openhabian with openHAB 2.5.11
Just installed the Nuki binding to control my Smart Locks via openhab2.
I have connected both Smart Locks to on bridge since the 2 doors are not too far away from each other.
In the Connection Status one Lock is green and one Lock is yellow, means both Locks have a connection to the bridge.
But in openHAB it only shows the one Lock with connection status green as online. The other one shows an error.
I now connected the 2 nd Lock to a separate bridge also to have a connection status green, now it works.
Anyone an idea why the lock with connection status yellow in the Nuki App does not get a connection in openhab?