this map http://osu.ppy.sh/s/52361 which is the one you talking about only have 6149 plays, so is not as popular as you think.
Or there is something wrong with the PP.(i always think there is something wrong with the pp,because my pp increase so slow)

Some of your older plays might've lost some ranks/their worth, or as peppy has said, some sort of calcuations are also made based on "playstyle", and the higher you progress, the better scores you always need. So perhaps that map was too easy based on your "playstyle" /speculation

may be it is not popular in ctb,(the playcount is still 200k when i switch to taiko and standard.)

I don't think they ever stop giving, the amount they just give, gets ridicilous low (like lower than 1, so basically to get 1 point, you need multiple of such scores)

So I started playing new maps, and I gained 11000 ranks in PP in one night, while only gaining 300 ranked score ranks. Now I seem to have lost 3000 PP ranks.

PP tends to be very bizarre at lower ranks. Once you maintain some some decent ranks/plays it will probably be more stable (cuz my PP stays pretty much the same no matter what I do lol)

I played new maps, that I never playerd before and my pp is getting up, but improving my old record doesn't give anything, that sucks ...

today I got 182 pp out of two hards played with hidden. the whole rest I played was worth 2 pp, though most of them were easy maps anyway, one was an approved hard, and the otrher a hard played with DT. I got 1600 ranks out of that.

I know, the system doesn't claim to be accurate on lower ranks, but... that's just ridiculous ._.

The new Best Performance section of your profile, located under "Top Ranks", displays what maps are earning you the most pp. Therefore, this discussion will now be infinitely more productive.

That said, I like how 8 of my top 10 pp givers were mapped by me and the other two are really, really old. I think that's a sign that I need to go off and FC some of the Insanes that I would be able to FC if I sucked up my pride and spent a week or two just playing harder Insanes. Oh, and it does seem that all of my mod-whoring Easy/Normal runs weren't very productive (thank goodness).

As an observation~

I've got around 70pp in 2 days without playing~ owo

And days before I got around ~10 pp for ranking #500 or highers.

There are more players that have months with no plays and their pp are increasing :c

oh wow
http://osu.ppy.sh/b/52407?m=0 is still one of the most pp giving score for me even tho its almost a year old already

This simply sux... <.<

I want the old OSU! ranking system T.T ç___ç

Talking about fluctuations, if you click my profile, check the beginning of my graph.I have yet to see another profile like it.