[Elecraft] k3 6m birdy?

[TMorton]

I have a birdy on 6m. The KRX3 is installed. When in SSB with 2.7 hz 
filter, the birdy goes from 50116 to 50119. However, if I put 50.118 in 
sub rcvr and listen on VFO A on 50.115 and hit "SUB", there is no birdy 
on VFO B. I am using a pair of stereo speakers/or stereo headset while 
doing this. When I change B to A via A/B, then birdy appears...any idea 
what's happening?
TI5KD was spotted on 50.118 and that's how I found the birdy....I sent a 
packet spot to TI5KD asking Keko to beam CX and listen on .115; that's 
how I discovered the above. Transmitting on 115 and monitoring both 115 
and 118.
73
Tom
CX7TT