my xbox capture (game DVR?) wont work

as the title suggests my xbox capture wont work and when it does it forces me into the "record what happened" screen and i cant back out of it! and its on because i checked numerous times and its on alright, it just wont work idk why... when i go to the
"capture" screen the top 3 items (record from now, capture a screenshot, and capture what happened) the "capture what happened" really confuses me cause when i go to capture something the "capture what happened" comes up... which shouldnt be possible... right?
cause when i back out of that screen it takes me back to my games/apps list (the 5 games/apps screen) idk what i did to cause this or is it a bug? i dont really know for sure! can someone help me on this?

:)