Why does my updateUIView change state at the same time

Code Block import SwiftUI
struct UIkitTextView: UIViewRepresentable {
   
  @Binding var isBold: Bool
  @Binding var isItalics: Bool
   
  func makeUIView(context: Context) -> UITextView {
    let view = UITextView()
    view.text = "Defutl"
    view.font = UIFont.systemFont(ofSize: 24)
     
    return view
  }
   
  func updateUIView(_ uiView: UITextView, context: Context) {
    uiView.toggleBoldface(isBold ? self : nil)
    uiView.toggleItalics(isItalics ? self : nil)
  }
   
  typealias UIViewType = UITextView
}