why snprintf can't be applied for both textArea with the same variable value

[miker]

I use STM32L431 to build a mainboard and LCD display, then develop the UI with touchGFX;  From the button of mainboard to triggle and transfer to screw1.cpp, the number of textArea(picture:red 1 ) can increase when i press the buttom of mainboard, but number of textArea(picture:red2) can't  any change and just display 00% with initial value; what was more, with the same code for the function of decrease, the function is ok that the number of textArea(picture :red2) can be visable and decrease when i pressed the buttom;

remark: increased and decreased number of center textArea is devided into 2 textAreas;

the function is fail and the top textArea is ok , but center textArea can't any change if pressed buttom, just list the initial value 0%

void Screen1View::speed_level(uint8_t speed,uint8_t big_spd)    // speed icon+
{ 
  Unicode::snprintf(speed_valueBuffer,SPEED_VALUE_SIZE,"%d",speed);  // display top textArea
  speed_value.invalidate();

  if(big_spd==1)      // when press buttom
  {
  big_speed.setVisible(true);     // visable textArea
  Unicode::snprintf(big_speedBuffer,BIG_SPEED_SIZE,"%d",speed);      // display center textArea
  big_speed.invalidate();
  }
  else if(big_spd==0)  // when release button
  {
  big_speed.setVisible(false);  // invisable textArea
  big_speed.invalidate();
}

decrease function is ok for following code

void Screen1View::spd_level(uint8_t spd,uint8_t small_spd)     // speed icon-
{ 
  Unicode::snprintf(speed_valueBuffer,SPEED_VALUE_SIZE,"%d",spd);    // display top textArea
  speed_value.invalidate();
  if(small_spd==1)           // when press buttom
  {
  small_speed.setVisible(true);
  Unicode::snprintf(small_speedBuffer,SMALL_SPEED_SIZE,"%d",spd);   // display center textArea
  small_speed.invalidate();
  }
  else if(small_spd==0)     // when release buttom
  {
  small_speed.setVisible(false);
  small_speed.invalidate();
  }
}

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