LED dot matrix display problem on proteus

const unsigned short letters[16] = {

0xFF, 0x01, 0xEE, 0xEE, 0xEE, 0x01, 0xFF, 0xFF,   //A
0xFF, 0x00, 0x76, 0x76, 0x76, 0x89, 0xFF, 0xFF   //B
};


unsigned short column, num, repeat, count;

void main() {
    latd = 0;
    latc = 0;
    TRISD = 0;
    TRISC = 0;
    ADCON0 = 0X00;
    ADCON1 = 0X0F;
    ADCON2 = 0x09;
    CMCON = 0x07;
    

    while(1) {
        for (num=0;num<2;num++){
          for (repeat=0; repeat<20; repeat++){
               column = 1;
           for (count = num*8;count < (num*8+8);count++){
               PORTD = letters[count];
               PORTC = column;
               column = column<<1;
               delay_ms(10);
               }
          }
        }
    }
}