No, you misunderstand. Your nails are softer than the glass, so it's more likely for the glass to scratch off particles from your nails themselves (which then adhere to the glass and look like scratches) than for your nails to scratch off any of the glass. You say you've actually seen it happen--you've actually watched as a new scratch appears as you run your nail along the glass--so I don't see what else could be occurring. (If you hadn't actually seen it happen, I'd say the marks are from something other than your fingernails.)My nails are clean I assure you there's nothing on them