It has been happening with almost all my plays, i went up from 2056pp or so to 2098pp even though it says i got 135pp for my play.
http://prntscr.com/liv3kw
osu! version: Stable 20181101.2 (latest)
http://prntscr.com/liv3kw
osu! version: Stable 20181101.2 (latest)