Yes, call Ruger. I bought mine about a year ago and it is pinned so it can't move. There have been other posts about the sights moving on the LC9 and they always (as best as I can remember) move to the left.
Just call Ruger CS it's free they send a prepaid mail envelope and a new pinned slide.
You take the old slide off , put the new one on and mail back the old one.
No down time and no cost. About 10 day turn around.
Ruger contact site: Ruger Contact