A message posted on its website, explained that the hitch resulted in subjects which originally had Grade B3 with the interpretation, GOOD being changed to Grade A1.
It explained that ordinarily, Grade A1 was interpreted as EXCELLENT, adding that "with the interpretation of A1 as GOOD still showing , clearly indicating an error.
It would be recalled that yesterday there was a rumor that the WAEC website was hacked and that the original results of candidates were changed.
The incident resulted in anxiety among candidates, parents and the general public.
"The system has been shut down and the problem resolved," the message said.
It assured members of the public that "our Results Database is secure and intact."
It apologized sincerely to the members of the public for the anxiety and inconvenience caused.