Extremely odd weld issues?

This script takes a center model and welds other models to it, and I had no problems with it until I got to the back side of the model. The weld won't move the outer model to the center model, instead it moves the center models piece that I want the outer model to move to, to the outer model (conclusively it's doing the weld backwards when all the other ones aren't)

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-------------------------------FRONT-------------------------------
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Weld = Instance.new("ManualWeld", script.Parent.Parent.Front.Holder)
Weld.Part0 = script.Parent.Parent.Front.Holder
Weld.Part1 = script.Parent.Front
Weld.C0 = CFrame.new(0,-1,5) * CFrame.Angles(0,math.rad(-90),0)
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--------------------------------LEFT-------------------------------
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Weld = Instance.new("ManualWeld", script.Parent.Parent.Left.Holder)
Weld.Part0 = script.Parent.Parent.Left.Holder
Weld.Part1 = script.Parent.Left
Weld.C0 = CFrame.new(-3,-1,0) * CFrame.Angles(0,math.rad(180),0)
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-------------------------------RIGHT-------------------------------
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Weld = Instance.new("ManualWeld", script.Parent.Parent.Right.Holder)
Weld.Part0 = script.Parent.Parent.Right.Holder
Weld.Part1 = script.Parent.Right
Weld.C0 = CFrame.new(3,-1,0) * CFrame.Angles(0,math.rad(180),0)
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--------------------------------BACK-------------------------------
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Weld = Instance.new("Weld", script.Parent.Parent.Back.Holder)
Weld.Part0 = script.Parent.Parent.Back.Holder
Weld.Part1 = script.Parent.Back
Weld.C0 = CFrame.new(0,0,0) * CFrame.Angles(0,math.rad(180),0)

"BACK" just won't work, any help is appreciated!