Why my youtube videos won't rotate on iphone?

You know I'm sure when i played my videos on my iphone in the past, my screen would rotate leftwards, now it goes right? Kind of upside down? Like it goes in the direction that the volume buttons are on the bottom, which is annoying! It used to be that if i wanted to change the volume, they'd be on top. When i lock the screen its ok but then it moves if I'm laying down. & if I try to lock the screen when its the way i want it, it goes back the other way? I think this only happened after i updated youtube the other day. Does anybody else know why this is? And how i can do it right?

On the home screen slide your finger up the phone, there should be a little menu and press the padlock picture with a rotation arrow around it.

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