On entering in a TEdit, it is doubling the text inside of itself

Question

I am using Embarcadero® RAD Studio 10 Seattle Version 23.0.20618.2753. I just started making a Mobile App. I placed two TEdit controls on one TForm. They are

Edit_FirstName: TEdit;
Edit_LastName: TEdit;

Now, when I am running this app on a mobile device and filling in my name, suppose I wrote Michael in the field Edit_FirstName and Schumacher in the field Edit_LastName. Up to this point, everything is OK.

But now, when I move back to the field Edit_FirstName and going to add @ after Michael, it should be Michael@ but instead it is becoming MichaelMichael@. The TEdit itself doubles the text which is already written inside of it, and then adds new characters after that.

It is a brand new Form project. I have not written a single line of code in this project.

The code is:

unit Unit1;

interface

uses
  System.SysUtils, System.Types, System.UITypes, System.Classes, System.Variants,
  FMX.Types, FMX.Controls, FMX.Forms, FMX.Graphics, FMX.Dialogs,
  FMX.Controls.Presentation, FMX.Edit;

type
  TForm1 = class(TForm)
    Edit_FirstName: TEdit;
    Edit_LastName: TEdit;
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.fmx}

end.

The fmx file is:

object Form1: TForm1
  Left = 0
  Top = 0
  Caption = 'Form1'
  ClientHeight = 414
  ClientWidth = 247
  FormFactor.Width = 320
  FormFactor.Height = 480
  FormFactor.Devices = [Desktop]
  DesignerMasterStyle = 0
  object EDIT_FirstName: TEdit
    Touch.InteractiveGestures = [LongTap, DoubleTap]
    TabOrder = 2
    Position.X = 72.000000000000000000
    Position.Y = 56.000000000000000000
  end
  object EDIT_LastName: TEdit
    Touch.InteractiveGestures = [LongTap, DoubleTap]
    TabOrder = 1
    Position.X = 72.000000000000000000
   Position.Y = 88.000000000000000000
  end
end

How do I fix this? Can anyone help me?

I'm sorry, but I'm having a hard time understanding what the actual problem is. Please show some actual code and examples of what you are seeing — Remy Lebeau, Aug 15 '20 at 07:02
Even though you haven't written any code, please include the `.fmx` file content in your post. — Tom Brunberg, Aug 15 '20 at 07:49
Thank you for updating the question. Previously it was indeed very hard to understand what you meant, but now it is crystal clear. I cannot reproduce the issue in Delphi 10.3 on Windows 7, however. — Andreas Rejbrand, Aug 15 '20 at 10:41
There is two details I would like to know: 1) You referred earlier to a PEST option, what do you mean by that? 2) It would be good if you show what settings you have for the edit fields, and that is best seen from the `.fmx` file (or with the form view active, select `view as text` from the popup menu) — Tom Brunberg, Aug 15 '20 at 13:29
I also cannot reproduce this problem on Delphi 10.3 on Win10, so please add the contents of your .Fmx file to your q. Please also explain **exactly** what you mean by "running this app in mobile ". — MartynA, Aug 15 '20 at 16:36
@TomBrunberg thanks for your interest in my problem. 1) Its PASTE not PEST i made mistake sorry for that. When i enter in any TEdit this option appears automatically. — Dharmesh Bhagatwala, Aug 15 '20 at 16:52
@MartynA Running this app means installed this single form as app in mobile to check y its behaving like this. — Dharmesh Bhagatwala, Aug 15 '20 at 17:00