I don't think it means anything particularly profound or significant, that you're missing.
It's just an observation that S/R levels tend not to be accurate. If you look at the previous/recent S/R levels on (say) a 1-hour chart, even the ones that are repeatedly "respected" by price over the next day or two or three will often turn out to be 5-10 pips "away from the line". In other words, they're approximate.
I don't think there's very much more than that principle to "elaborate"?
And welcome to the forum.