Happened to me a few times last winter and once this winter as well. I think it's happening when you get home or to work and there's a bit of sand on the windshield from driving. When you push the scrapper across the windshield, every now and then it'll catch a grain of sand just right and if the grain of sand is harder than then glass, it'll scratch it. Try and remember to run your wipers after you park and are expecting to scrape next time you get in. I've been doing that and so far no more scratches. I'm also pulling back with the ice scraper rather than pushing on it, that may help prevent scratches.
As for a fix, I haven't found anything yet than I'm willing to try. Maybe there's some sort of glass polisher than can smooth it out? One of the scratches is right in my line of view, lol. It's annoying.
