This bug seems that has not been solved.
I take two screenshoots a long time ago of a beatmap without spinners:
I take this the day the map gets ranked
I take this 5 days after
As you can see, many of the scores simply dissapear of the scoreboard. And if you look the scoreboards today (
https://osu.ppy.sh/s/375668) some scores returns to the scoreboard (for example, Soweon was inn the lead in the first photo, in the second the score dissapear and today he's 2nd) But if you open the song with this link
https://osu.ppy.sh/b/822693 there are other people in the entire scoreboard.
I have seen this in a lot of beatmaps.