As I mentioned earlier , usually after after initial eligibility assessment is conducted and the case analyst conclude that an officer review is required, usually if it's something more technical beyond inland VO knowledge , its then sent to the closest VO to your home country were someone there verify's your documents (i.e. call up your employer, call you personally or maybe conduct part of the background search on you via back channels with local authorities).I thought same but looks like files have been transferred to outland LVOs consistently but I am not sure at which stage.
All of this could happen for a number of reasons, no one outside IRCC really know, but judging by trends thats pretty much what should happen