I have recently acquired a pair of balanced headphones and am using them with a 4 pin xlr to ts adapter as illustrated in the manual.
I have noticed a bit of a strange behavior: when disconnecting the headphones first from PH 1/2 and then 3/4, the display goes back to Main Output 1/2, however if disconnecting headphones in reverse order (first 3/4 and then 1/2), the sound output switches to Output 1/2 but the display shows Phones 3/4 and the vol pot has to be toggled to select Main 1/2.

Was wondering if this is by design (if so why) or a bug in the firmware ?

Thanks.