key remaping menu

i made a script scene where the player can replace the key bindings this is the script :

  public Button changeUp;
     public Text upText;
     public bool lookforUp = false;
 
 
 public void ChangeUp() { // this is put OnClick on the button "changeUp"
         if (lookforUp == false)
         {
             lookforUp = true;
            
             upText.text = "";
         }
 
     }
 
 void Update () {
         Up();}
 
   void Up() {
         if (lookforUp == true)
         {
             if (Input.GetKey("mouse 0"))
             {
                 upText.text = "mouse 0";
                 Inputs.inputs.up = upText.text;
             }
             else if (Input.GetKey("left shift"))
             {
                 upText.text = "left shift";
   lookforUp = false;
                 Inputs.inputs.down = upText.text;
             }
             else if (Input.GetKey("escape"))
             {
                 upText.text = "escape";
   lookforUp = false;
                 Inputs.inputs.up = upText.text;
             }
             else if (Input.GetKey("space"))
             {
                 upText.text = "space";
   lookforUp = false;
                 Inputs.inputs.up = upText.text;
             }
             else if (Input.GetKey("enter"))
             {
                 upText.text = "enter";
   lookforUp = false;
                 Inputs.inputs.up = upText.text;
             }
 
             else if (Input.GetKey("mouse 1"))
             {
                 lookforUp = false;
                 upText.text = "mouse 1";
                 Inputs.inputs.up = upText.text;
             }
             else if (Input.GetKey("mouse 2"))
             {
                 lookforUp = false;
                 upText.text = "mouse 2";
                 Inputs.inputs.up = upText.text;
             }
 
             else if (Input.anyKeyDown)
             {
                 Debug.Log(Input.inputString);
                 lookforUp = false;
 
                 string temp = Input.inputString.Substring(0, 1);
                 upText.text = temp;
                 Inputs.inputs.up = upText.text;
             }
         }
     }

and that gets repeated with 18 more buttons

the problem is that when i press on multiple buttons, after pressing a key all the pressed keys' text get changed to the same key

(if on Input.GetKey("mouse 0") i put looklookforUp = false changes very fast from "mouse 0" to "")