I have a problem moving an SKSpriteNode, it seems pixel vs. points related

I am trying to place a border on top of a white block.

When I set the border's Y positioning only based on the height of the block, I get what I expected: The border is half into the block. Screenshot, top half

The next logical step:
I adjust the border's Y position to include half of its own height. What I expect is the bar resting on top of the block. But for some reason, the border is way above the block. Screenshot, bottom half

Am I somehow confusing pixels for points?

When I do take the border's height into account, I use this line:

self.position = CGPoint(x: myGV.safeSceneRect.width/2, y: myGV.gemBaseSize.height + (self.size.height/2))

Below in order:
My code for the border,
Print out of sizes and positions
a link to the two screen shots

Code Block 
import Foundation
import SpriteKit
class MyBorder : SKSpriteNode{
    var nodeType = NodeType.border
    init(){
         //create SKSpriteNode, size it based on screen size
        super.init(texture: SKTexture(imageNamed: "border"), color: .clear, size: CGSize(width: myGV.safeSceneRect.width, height: myGV.safeSceneRect.height * 0.07))
        self.anchorPoint = CGPoint(x: 0.5, y: 0.5)
        self.isHidden = true
        self.isUserInteractionEnabled = false
        self.zPosition = theZ.border
        self.alpha = 0.5
        // position border on top of block
        self.position = CGPoint(x: myGV.safeSceneRect.width/2, y: myGV.blockBaseSize.height)
        print("Screen Size \(myGV.safeSceneRect)")
        print(“Block Size \(myGV.blockBaseSize)")
        print("Border Size \(self.size)")
        print("Border Pos \(self.position)")
        myGV.gameScene!.addChild(self)
        self.isHidden = false
    }
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

Here is the output for both runs, same order as the image

> Screen Size (0.0, 44.0, 375.0, 734.0)
Block Size (300.0, 146.8)
Border Size (375.0, 51.380001068115234)
Border Pos (187.5, 146.8000030517578)

Screen Size (0.0, 44.0, 375.0, 734.0)
Block Size (300.0, 146.8)
Block Size (375.0, 51.380001068115234)
Border Pos (187.5, 172.49000549316406)

www .warptv.com/links/screens.png