[CQ-Contest] Broken hardware or lazy ops?

[Matt Clauson N0QXW]

Hello, all.  I've really started to get more into contesting, so you'll
probably be hearing me more on the air as time goes on.  This was my
first RTTY contest, and I noticed a wierd idiosyncracy.  I'm not certain
what to make of it.  Let's look at the following exchange (other
callsigns redacted to protect the guilty):

K1ABC:  CQ CQ NAQP DE K1ABC K1ABC NAQP CQ
N0QXW:  N0QXW
K1ABC:  N0QX BILL BILL VT VT N0QX
N0QXW:  N0QXW NOQXW K1ABC MATT MATT MT MT K1ABC DE N0QXW N0QXW
K1ABC:  N0QX TU QRZ DE K1ABC

As you can probably guess, my name isn't Martin and I don't live in
Texas, like the legitimate N0QX does...  Although I wish him lots and
lots of contacts.  I'd think that my hardware is putting out bogus
audio, but let's look at another busted contact from this weekend:

W4XYZ:  CQ TEST CQ TEST DE W4XYZ W4XYZ TEST
N0QXW:  N0QXW N0QXW N0QXW
W4XYZ:  N0QX WARREN WARREN AL AL N0QX
N0QXW:  N0QXW N0QXW N0QXW W4XYZ MATT MATT MT MT W4XYZ DE N0QXW N0QXW
W4XYZ:  WN0QX QSL TU DE W4XYZ QRZ?

I guess the lesson here is to not give my exchange information until I
get my callsign returned to me correctly.  Anyone else experience
something similar?

--mec