Bug about 'Foreign Key'

PostgreSQL Developers,

I have a PostgreSQL 7.0.2 running at Conectiva Linux, with kernel 2.2.14, with 56 Mb of data.

I'd created a table:
Create Table Andamento (
    Etiqueta integer not null,
    CodTecnico integer not null,
    DtInicio timestamp not null,
    DtLiberacao timestamp null,
    Primary Key (Etiqueta),
    Foreign Key (Etiquetas) References Etiquetas (Etiqueta) On Delete Cascade)
                     
I wrong a field name in Foreign Key declaration, and PostgreSQL created it!
Before this, I always named triggers and constraints, but, at this time, I'd tried this way.
Well, look the trigger at table Etiquetas:
CREATE CONSTRAINT TRIGGER "<unnamed>" AFTER DELETE ON "etiquetas"  NOT DEFERRABLE INITIALLY IMMEDIATE FOR EACH ROW EXECUTE PROCEDURE "RI_FKey_noaction_del" ('<unnamed>', 'andamento', 'etiquetas', 'UNSPECIFIED', 'etiquetas', 'etiqueta');

It says exists a field named etiquetas at table Andamento.
I'd droped table andamento (Drop Table Andamento) and the trigger referencing it didn't droped.

I solved it with pg_dump.