Marlin 1895 SBL Rear Ghost Ring Movement?

Just hoping to get some clarification on the rear ghost ring on a newer 45-70 SBL. The ring itself, moves ever so slightly left to right. Is that normal? It sort of bothers me, thinking it’s not supposed to do that. If I’m needing to replace it, I will. It doesn’t move far enough either way that I can’t see through it, it just seems like something that shouldn’t move at all. But I guess maybe, it’s normal I was just wondering if anyone else knew the answer.