Did you install it yourself? If so, MAYBE you did something incorrect, or used an inferior product? I have been using one on my Note 10+ for a little longer than that and it's flawless. Have used them in the past as well, they shouldn't show scratches AT ALL.
@FreakShow liquid screen protectors don't really protect from scratches. They put an extra layer of glass on top of your existing screen, and they do usually wear off depending upon use (usually 6 months-1 year).