Code for a 74HC595 Shift register running an SH5261AS 2 digit 7 segment display

shiftReg7Seg.ino

/* Running on an arduino uno with a 74HC595 Shift register to control the display

*/



int latchPin = 5;
int clockPin = 6;
int dataPin = 4;
 
byte leds = 0;

/*
 * shift Reg to 7seg pinout, in bit position in byte variable above
 * A - 7
 * B - 6
 * C - 1
 * D - 4
 * E - 3
 * F - 0
 * G - 5
 * DP - 2
 * 
 */
void setup() 
{
  pinMode(latchPin, OUTPUT);
  pinMode(dataPin, OUTPUT);  
  pinMode(clockPin, OUTPUT);
  updateShiftRegister();
  Serial.begin(9600);
}
 
void loop() 
{
    //this loop works fine
  for(int i=0; i<10; i++) {
    Serial.println(i);
    displayDigit(i);
    delay(1000);
  }
 
  
  

}

  //this is where the problems are. There's some kind of issue with the leds byte value
  //something in the way the 595 is being addressing is causing the problem, this function is inputting the correct value but it isn't outputting the right result on the display
  void displayDigit(int digit) {
    leds = 0;
    updateShiftRegister();
    delay(10);
    //A
    if(digit!=1 || digit!=4) {
      bitSet(leds, 7);
      updateShiftRegister();
      delay(10);
    }

    //B
    if(digit!=5 || digit!= 6) {
      bitSet(leds, 6);
      updateShiftRegister();
      delay(10);
    }

    //C
    if(digit!=2) {
          bitSet(leds, 1);
          updateShiftRegister();
          delay(10);
    }
    
    //D
    if(digit!=1 || digit!= 4 || digit!=7 || digit!=9) {
          bitSet(leds, 4);
          updateShiftRegister();
          delay(10);
    }
    
    //E
    if(digit==2 || digit==6 || digit==8 || digit==0) {
          bitSet(leds, 3);
          updateShiftRegister();
          delay(10);
    }
    
    //F
    if(digit==4 || digit==5 || digit==6 || digit==8 ||digit==9 || digit==0) {
      bitSet(leds, 0);
      updateShiftRegister();
      delay(10);
    }

    //G
    if(digit!=1 || digit!= 7 || digit!=0) {
      bitSet(leds, 5);
      updateShiftRegister();
      delay(10);
      
    }
    
  }

  void empty() {
    leds = 0;
    bitSet(leds, 5); 
    updateShiftRegister();
  }

  void dp() {
    bitSet(leds, 2);
    updateShiftRegister();
  }

  void clearDisplay() {
    leds = 0;
    updateShiftRegister();
  }
 
void updateShiftRegister()
{
   digitalWrite(latchPin, LOW);
   shiftOut(dataPin, clockPin, LSBFIRST, leds);
   digitalWrite(latchPin, HIGH);
}