[Elecraft] AFSK A anomaly?

[Mike Murray]

I played a bit in the RTTY RU this weekend with my new-to-me K3 to learn
the operation and iron out any kinks in my setup.  Everything worked well
except for a problem (?) on receive.  I was able to easily tune in signals
and copy using MMTTY, but when I tuned to the other side of zero beat I
could easily hear the same signal.  Obviously, it was inverted, but I was
surprised to even hear it at all.  Is this normal or do I have something
setup incorrectly?

Mike -  W0AG