Seeing double output in SELECT SYSDATE FROM DUAL

[Yaroslav K. Kravchishin]

Oracle 7.0.1 Server
When I type
SQLselect sysdate from dual;

SYSDATE
---------
01-OCT-03
01-OCT-03

2 rows selected.

SQL>

What's wrong? It was Ok yesterday. I suppose that system.dual loads
two times. How to fix it?