[RTTY] Who is WO Ø Z

[Dick Kriss, AA5VU]

During a recent RTTY test, I decoded a wo0z calling CQ but later it changed
to w0ek.  I am not sure what was going on but it really got confusing.
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$9-415#7ØØ./CQ CQ TST USØMM USØMMKJAFLVEHWOØZ WOØZ WOØZ WOØZ WOØWOØZ
KOOAEEEAEEEAEEEQKHZQMZCJOUZTE
WOØZ WOØZ WOØZUP 
WOØZ WOØZ DE WØEK WØEK WØEK K
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Anyone seen anything like this before.

73 de Dick, AA5VU