You'll need to set the alpha to 0 when it's loaded as well, or else it will be shown until moused over.
soo:
Code:
self.Experience:SetScript('OnEnter', function(self) self:SetAlpha(1) end)
self.Experience:SetScript('OnLeave', function(self) self:SetAlpha(0) end)
self.Experience:SetAlpha(0)