I record my video on my iPhone in landscape but it saves it as portrait?

IIm trying to make a speed drawing video which i have done before so I don't understand why my phone is doing this? I set my phone up on top of some books to see what IIm recording and I make sure it isn't locked on portrait mode. If i record for a very short amount of time it will show up as landscape but my 7 minute video isn't saving as such. Not sure what to do.

I have this problem too