There is a checkmark button to confirm stat point distribution at the bottom of the stat window (which may not be immediately visible at low resolutions, ie if you are playing on a netbook). Unfortunately, if you save the game and reload without confirming the distributed points, they will be lost.
If you don't have a recent save you can reload (from before loosing the stat points), you can use
iZakaroN's SaveEditor (or from
Kiya's site, with description) to give yourself enough stat points to compensate.
If you wait long enough for any food/potion/spell effects to wear off and remove all equipment with stat bonuses (or make sure to take them into account), then the sum of
strength + agility + intelligence + constitution + any unassigned stat points
should be equal to
40 + 5*(Character Level) +
(+5 or -5 bonus from Shrine of Good and Evil) +
(+5 or +10 stat bonus from Wishing Well, if that was the wish you made) -
(1 to 4 stolen by vampire in the dark cave if you saved the boy) +
(+20 from the agility bonus of Finnigan's magic lockpick)(spoilers; highlight the text to read)
The terms in spoiler text you will have only encountered if you have explored the far east or north east of Ferol (the first map), or been to Verdistis.
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