Problem is in circle fuction.

import Foundation
import SwiftUI

struct Node: Decodable, Hashable {
    public let id: Int
    public var x: Double
    public var y: Double
    public let text: String
    public var red: Double
    public var green: Double
    public var blue: Double
    public var shape: Int
}

extension Node {
    mutating func circle() -> some View {
        Circle()
            .fill(Color(red: red, green: green, blue: blue))
            .frame(width: 64, height: 64, alignment: .center)
            .position(x: x, y: y)
            .gesture(DragGesture()
                .onChanged { value in
                    self.x = value.translation.width
                    self.y = value.translation.height
                }
                .onEnded { value in
                    self.x = 0
                    self.y = 0
                }
            )
    }

    func square() -> some View {
        Rectangle()
            .fill(Color(red: red, green: green, blue: blue))
            .frame(width: 64, height: 64, alignment: .center)
            .position(x: x, y: y)
    }

    @ViewBuilder mutating func drawShape() -> some View {
        switch shape{
        case 1: circle()
        case 2: square()
            default: Text("Failed")
        }
    }

    func label() -> some View {
        return Text(text)
            .font(.system(size: 30))
            .bold()
            .position(x: x, y: y)
            .foregroundColor(Color(red: 0.25, green: 0.25, blue: 0.25))
    }
}