help in TM 1637 to show two differert variable at same time

sir ,
i tried tm1637 first time . i want to see two different variale same time on display. 1rst variable on digit1&2, second variable on digit3&4. both variable will be in (0-99).
as i understand library’s functions. i uploaded this code

#include <Arduino.h>
#include <TM1637Display.h>
#define CLK 2
#define DIO 3
TM1637Display display(CLK, DIO);
int Reading1 = 44;
int Reading2 = 55;


void setup()
{
  display.setBrightness(7);
}
void loop()
{
    display.clear();
    display.showNumberDecEx(Reading1,0,false, 2, 0); // Reading1 is First Variable on Display   /
    display.showNumberDecEx(Reading2,0,false, 4, 0); // Reading2 is second Variable on Display    
 
  Reading2++;
  Reading1++;
  delay(1000);
	}

but i got, second variable is being show on digit3&4. but 1st variable is not being show.it is flickering on
digit1&2 . can’t be seen like second.
you can see result in this video

so what is wrong in code???
Also tell code to semi colon turn on without affecting digits. Because code include in example for semi colon is affecting other digits value.
Please , solve my upper both issues for display .
???

If you want to use the built in functions of a library you must look at the library files to see what each parameter does.

In this case you need to look at the TM1637Display.h file.

Review this line:
showNumberDecEx(int num, uint8_t dots = 0, bool leading_zero = false, uint8_t length = 4, uint8_t pos = 0);

#include <Arduino.h>
#include <TM1637Display.h>

#define CLK 2
#define DIO 3

TM1637Display display(CLK, DIO);

int Reading1 = 0;
int Reading2 = 99;

void setup()
{
  Serial.begin(9600);

  display.setBrightness(7);
  display.clear();

} //END of setup()



void loop()
{
  //showNumberDecEx(int num, uint8_t dots = 0, bool leading_zero = false, uint8_t length = 4, uint8_t pos = 0); <----<<<<
  display.showNumberDecEx(Reading1, 0, false, 2, 2);
  display.showNumberDecEx(Reading2, 0, false, 2, 0);

  //turn on the :
  //display.showNumberDecEx(Reading2, 0b01000000, false, 2, 0);


  Reading1++;
  if (Reading1 > 99)
  {
    Reading1 = 00;
  }

  Reading2--;
  if (Reading2 < 0)
  {
    Reading2 = 99;
  }
  
  delay(500);


} //END of loop()

Turn on the :
display.showNumberDecEx(Reading2, 0b01000000, false, 2, 0);