The code is not scannable

[L1cardo]

This one is generated by CarBode-Barcode-Scanner-For-SwiftUI

This one is generate by myself with code

func generateQRCode(from string: String) -> UIImage? {
    let data = string.data(using: String.Encoding.ascii)

    if let filter = CIFilter(name: "CIQRCodeGenerator") {
        filter.setValue(data, forKey: "inputMessage")
        let transform = CGAffineTransform(scaleX: 3, y: 3)

        if let output = filter.outputImage?.transformed(by: transform) {
            return UIImage(ciImage: output)
        }
    }

    return nil
}

And here is my question:

1. The one generated by CarBode-Barcode-Scanner-For-SwiftUI looks weird, like there is some offset in every dot.
2. And it can’t be scannable. :(

Any idea please?