I'll try to keep my opinion simple. After looking at the video several times, it basically just comes down to the fact that you hit your release on the first shot and missed it slightly on the second.
Obviously staying behind the ball in the first shot and following through the ball from more underneath will produce a follow-through more extended and in line with your arm swing which made it stay "in front of your face".
In the second shot, it looks like you came around the ball or missed it more and the arm kind of "flailed" out producing the follow through to the right.
That's my analysis and I'm a big believer of when you hit the relase, everything from that point on will go as it should. Now...what causes you to miss your release? Could be many things: Timing, footwork, arm swing, bad-fitting ball, lack of mental focus, etc...etc... That is the real key you need to ask yourself in my opinion.
BTW...overall it looks like you have a very solid and smooth game and great foundation. The fact that you spent 3 days training with lessons to improve leads me to believe you are serious about the game and will fix these small problems.