On my 750 there are options to flip the video vertically and horizontally. I have my rear camera mounted upside down and flipped the video to suit the mounting. There is probably the same on the 900?
as I said 'it can be automated' no idea if they have, but if there is no menu setting for it then it is something to check, it could just be that they messed up and forgot about people that mount their cameras the other way, you would hope not though