Actually the thing is.. he started his study in fall 2020 online and then after completing 1st semester he got refused. We raised a webform his file reopened and then he recieved visa few days ago. But they issued the visa in back date from july to sep. However the approval was recieved on 16 august. We don’t know what happened. Now he will be travelling to canada and we are confused. Also if he renews his passport now, i think it will be a problem since the visa is tied to the old passport. Also, we have already booked his ticket.