Might be more complex than that, if of one starts dumping it early you can get a flipped-face closed-pull hook with a path and face that were looking real good form most of the swing.
i experienced that last week, I think it's due to underrotation of my left forearm. So it's close at the top and then i try to open it and then close it LOL that's why it's inside out.
Yeah I just took some video from today and I get VERY FLAT on the downswing. Think of the flattest downswing possible and I could beat it. I might have to give the towel plane board a try.
I had the same thing happen to me lately. Pull hooks with the longer clubs on the range. Then I let the d plane set me free. Add some carry swing left...straight city.