If this were Glock Talk I wouldn't answer this question. (Because I'm sick of hearing it!) Your new G-17 is perfectly normal. You could fix the symmetry of your dust cover at home by dipping it in hot water for a minute or two and, then, pressing it against the flat edge of a table; however I, personally, wouldn't encourage you to do that.
In the past 6 months it seems like every new Glock owner on the planet has discovered this feature. True, it doesn't occur on ALL Glocks; but, myself, I consider it to actually be an advantage; and, I wouldn't think of changing the upswept dust covers on either one of my daily carry Glocks.
This is because when a Glock fires the frame tends to flex upwards between the trigger guard and muzzle. If you, also, hang a gun-mounted light on there the pistol can actually start to bind. It's been my own experience that my Glock frames seem to flex less (or more slowly?) if the end of the dust cover sweeps upward and makes contact with the slide.
Me? If I can't see the recoil spring on a Glock, then, I'm uneasy about using the pistol for anything serious. Now, the next complaint is usually; 'Why does my new Glock's barrel point, upward, at the sky when the slide is locked back?'