FauxScrollFrame Offset Issues

[Damon]

I am having issues with the ScrollFrame setting it's offset when updated.
It is a list of the 40 raid members, showing 20 at a time and here's the update function.

Source RPS.lua:
FauxScrollFrame_Update(RPSRaidFrameScrollBar,40,20,20);

Source RPSForm.xml
<OnLoad>
              FauxScrollFrame_Update(RPSRaidFrameScrollBar,40,20,20);
</OnLoad>
<OnVerticalScroll>
              FauxScrollFrame_OnVerticalScroll(20, RPS_RaidFrame_Update);
</OnVerticalScroll>
<OnShow>
             RPS_RaidFrame_Update();
</OnShow>