Get wrong line (16) when setting a breakpoint at line 29

[jfongattw]

It runs under Python 3.8 and Windows 8.1 x64. Although it's running a previous version here, but the same result in ver 2.0.0.1 too.
The followings are the result of after adding print() in the function CalcScopeLine() to show what errors I had got:

def CalcScopeLine(self, lineno):
    print(lineno)
    rvl = copy.copy(self.m_valid_lines)  # m_valid_lines has strange result
    rvl.reverse()
    print(rvl)

    for l in rvl:  # JF@21DEC2022, this will cause a correct lineno (29) changes to an incorrect l (16)?
        if lineno >= l:
            break
    return l

-----the main window
e:\Works\Python\ttkwidgets-master\examples>py ....\rpdb2.py example_calendar.py
....\rpdb2.py:296: DeprecationWarning: the imp module is deprecated in favour of importlib; see the module's
documentation for alternative uses
import imp
RPDB2 - The Remote Python Debugger, version RPDB_2_5_0,
Copyright (C) 2005-2009 Nir Aides, 2013-2017 Philippe Fremy
Type "help", "copyright", "license", "credits" for more information.

*** Password has been set to a random password.
*** Starting debuggee...
*** Attaching to debuggee...
*** Debug Channel is NOT encrypted.
*** Successfully attached to
*** 'e:\works\python\ttkwidgets-master\examples\example_calendar.py'.
*** Debuggee is waiting at break point for further commands.
bl
List of breakpoints:

Id State Line Filename-Scope-Condition-Encoding

bp 29

bl
List of breakpoints:

Id State Line Filename-Scope-Condition-Encoding

0 enabled 16 ...\examples\example_calendar.py

list
Source lines for thread 111776 from file 'e:\works\python\ttkwidgets-master\examples\example_calendar.py':

      1  # -*- coding: utf-8 -*-
      2
      3  # Copyright (c) Juliette Monsel 2018
      4  # For license see LICENSE
      5

C> 6 from ttkwidgets import Calendar
7 import tkinter as tk
8
9 def validate():
10 sel = calendar.selection
11 if sel is not None:
12 label.configure(text='Selected date: %s' % sel.st...
13
14 window = tk.Tk()
15 calendar = Calendar(window, year=2022, month=10, selectfo...
B 16 selectbackground='red')
17 calendar.pack()
18
19 tk.Button(window, text='Select', command=validate).pack()
20 label = tk.Label(window, text='Selected date:')

---

-----the other window
e:\Works\Python\rpdb2.py:296: DeprecationWarning: the imp module is deprecated in favour of importlib; see the
module's documentation for alternative uses
import imp
6
[285, 284, 277, 276, 275, 273, 271, 16, 15, 14, 9, 7, 6]
29
[285, 284, 277, 276, 275, 273, 271, 16, 15, 14, 9, 7, 6]

The example_calendar.py file has only 30 lines long. What is the line 271 and aboves?
and line 29 is missing obviously

[jfongattw]

Run it under Python 3.4 and this error is gone!!