When I try to import some person accounts, the owner id is changed to that of system admin. My csv doesn't have ownerid column. Can anyone tell me why ownerid is updated without that column in the csv please?

@Archana Panda I read another link and I understood that if the owner id is not there in the CSV, the owner id will be set to the id of the logged-in user even if it is an update operation. But that seems stupid to me. Why would SF implement it like that?