Hey how’s it going? Good I hope, sometimes when building a file the pieces for each side may or may not be different. In your case it seems like they are different. In most cases that I have experienced personally the piece that is not symmetrical usually has another piece that goes to it. For reference, look at both sides of your helmet in pepakura viewer and click on the pieces individually. If there are other pieces that go to the non symmetrical piece you should be able to tell very quickly. Hope this helps you out some if not I tried lol but cheers dude!