If we passed all of steps and in final review stage, is possible the main officer thought we should do security check again??that I can't explain my friend . it's always like that , they always tell you it's not started and suddenly it's passed . happening to many of us recently.
after you passed all the checks there's still final review , the main officer will go through your file and check if everything is valid , then if he or she has no concern otherwise they will issue a DM and PPR will follow . I believe that's the procedure.