Neat! Try "XxXxXxXxXx", max speed/legibility/width, style 2. The results are bonkers. It's just loops and scribbles. Interestingly, if you write your X's from top-right to bottom-left, top-left to bottom-right order, you can sort of see this in action. Grab a sheet of paper and try to write "xxxxxxxxx" really fast. You will see that loops are extremely common. I think this might be a coincidence, but it's possible it sees the kerning of two x's as a loop, then gets caught up in that false state of drawing loops.