I agree with both Rustyredcab & Haddockd that you have an OTT swing.
Please carefully read this article written by Mike Pedersen as it will shed some light on what an OTT swing is, what are some of the causes, and remedies.
But basically, your back swing is the first fault. Once you get to the top of the backswing, you also make the mistake of moving down with your upper body.
It's important for you to understand that both your takeaway...