Your health and power issues should be fixable by setting their text to nothing.
Code:
self.health.value:SetText(' ')
self.power.value:SetText(' ')
As for your orb issues..
Code:
self.orbs[i]:SetPoint('LEFT', self.orbs[i-1], 'RIGHT', -2, 4) -- defaultvalue = -2, 0
self.orbs[i].bg:SetPoint('LEFT', self.orbs[i-1].bg, 'RIGHT', -2, 4) -- defaultvalue = -2, 0
This is basically telling the new orb to anchor itself & the bg to the previous orb as well as moving 2 to the side of it (x-axis) and 4 above it (y-axis). You will want to change 4 back to 0 and they should all be in a straight line.