Contradicting "discarded message from non-member " WARN message

Sometimes when you run perf tests, at the end you get WARN messages like this:

2008-05-28 12:29:16,422 WARN [NAKACK] (IncomingPacketHandler (channel=perf)) 127.0.0.1:32908] discarded message from non-member 127.0.0.1:32908, my view is [127.0.0.1:32908|1] [127.0.0.1:32908, 127.0.0.1:32911]

Something doesn't look right with the warning message. How can it discard a
message from a member which is part of the view? The message seems to
contradict itself.

Bela: "What happened here is probably that the value of my_view was changed, and
JGroups printed the old value. "