[The Kook Abides]

My 30 open has twin 330 Cummins QSB 5.9's

Is this normal?  

I can start and stop each engine individually with it's appropriate engine key.

Once both engines are running together, they only shut off together when both keys are turned off.

Turning off one key does not kill that engine until both keys are turned off, then both engines shut down.

I can't turn off one engine by itself after both engines are running.

Does anyone else experience this on their Tiara?  Are my ignition switches wired wrong?

Thanks in advance