Double messages!

I am trying to use the Cygwin to write my fuctions (postgresql).the problem is that I receive two times each message that produce my function (eg RAISE NOTICE "........").
If i use the pgadmin, this problem doesn t exist
Why?
Could You please help me?

Thank You In Advance
TGK
PS : Create Function ..... Returns Integer AS'
Begin
Raise Notice '\ OK '\;
Return 0;
End'
language 'plpgsql';

Pg admin produces : OK

Cygwin produces: OK
OK

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