I have a theory that some officers are not authorized to sign off and give the final approval, they can take the interview, gather the facts but then a superior has to sign off on it. This kinda stuff happened at the AOS stage too where applicants seemed to have great interviews but were left with their cases remaining pending where others got approved at the interview itself, so luck of the draw if your interviewer has the necessary credentials.
So if correct, hopefully its just a case of waiting for the official procedures to kick in.