Insert statement inserts wrong random numbers into table Oracle

I try to generate sample data, therefore I would like to insert multiple rows into my Oracle table. Column values should be in between 1-5 and should be totally random. I need 20 random whole number.

My insert statement:

BEGIN
FOR i IN 163 .. 400 LOOP
INSERT ALL INTO results
  (student_id,OPN1,OPN2,OPN3,OPN4,AGG1,AGG2,AGG3,AGG4,NEU1,NEU2,NEU3,NEU4,EXT1,EXT2,EXT3,EXT4,CSN1,CSN2,CSN3,CSN4)
  VALUES
  (i,
  round(dbms_random.value(1,5)),
  round(dbms_random.value(1,5)),
  round(dbms_random.value(1,5)),
  round(dbms_random.value(1,5)),
  round(dbms_random.value(1,5)),
  round(dbms_random.value(1,5)),
  round(dbms_random.value(1,5)),
  round(dbms_random.value(1,5)),
  round(dbms_random.value(1,5)),
  round(dbms_random.value(1,5)),
  round(dbms_random.value(1,5)),
  round(dbms_random.value(1,5)),
  round(dbms_random.value(1,5)),
  round(dbms_random.value(1,5)),
  round(dbms_random.value(1,5)),
  round(dbms_random.value(1,5)),
  round(dbms_random.value(1,5)),
  round(dbms_random.value(1,5)),
  round(dbms_random.value(1,5)),
  round(dbms_random.value(1,5)))
  SELECT * FROM DUAL;
END LOOP;
COMMIT;
END;

It works but in one row the numbers are all the same. It is not generating a new random number to every column, just one and insert it to all fields of my table. Why is it happening? You can see it after 102 id row. First inserted row (163 id) is already wrong.