Was it OK before the windshield was put in? If so the windshield installer tweaked your wiper transmission which is the linkage that is shown in the video. Most people can't finesse the wiper arms off and end up bending something. As you know and in the video the arms are keyed and only go onto the transmission one way. You could try swapping arms left to right, I believe they are the same so maybe just the arm is bent.