LCD shows strange behavior upon micro-controller reset

I have written a code for the 'PIC18F4550' micro-controller (20MHz xtal) which shows "Speed = xxx RPMs" on an HD44780 LCD in 4-bit mode, where the xxx is the value contained in the variable called 'input'. The compiler used is xc8 and I'm programming using the PICKIT3. I have run the simulation in proteus and it all goes good until I reset the PIC using the MCLR pin. It really shows an anomalous output where I can't seem to understand which part is going wrong. I've also implemented this on hardware and it behaves exactly like it does in the simulation. I read something similar to this problem and people were suggesting that the enable pin must be messing up at reset but I don't see how that might be happening here so please try to help guys. I'm out of ideas here.

#include <p18F4550.h>
#include <stdio.h>
#include <stdlib.h>
#include <delays.h>
#include <string.h>
#define _XTAL_FREQ 20000000
#define LCD_out PORTD
#define rs PORTCbits.RC0
#define rw PORTCbits.RC1
#define en PORTCbits.RC2


//---------------------//

void lcd_cmd(unsigned char a);      //for LCD commands
void lcd_data(unsigned char b);     //for LCD data
void lcd_reset(void);               //to initialize 4-bit mode
void lcd_init(void);                //primary initialization instructions
void string_display(char *p);       //to display character strings/arrays
void shift_right(int a);            //right cursor shift
void shift_left(int b);             //left cursor shift
void delay_10ms(int t);             //delay in multiples of 10ms
void fragment (int x);              //fragments,processes & displays int data

//.....................//

void main(void)

{
    TRISC=0;
    TRISD=0;
    int input=0;
    char text1[] = "Speed = ";
    char text2[] = "RPMs ";

    lcd_init();
    string_display(text1);
    shift_right(4);

    string_display(text2);
    shift_left(9);

    while(1)
    {
        input++;
        fragment(input);
    }
}


void fragment (int x)
{
    int number[3];
    char final_num[4];
    int flag = 0;

    number[2]= (x/1)%10;
    number[1]= (x/10)%10;
    number[0]= (x/100)%10;

    if(number[0]==0)
        flag++;
    if(number[1]==0 && number[0]==0)
        flag++;

    int temp=0;
    for(int i=flag;i<=2;i++)
    {
        final_num[temp]='0' + number[i];
        temp++;
    }

    if(x<1000)
    {
        string_display(final_num);
        shift_left(temp);
    }

    else
    {
        char nul[]="NUL";
        string_display(nul);
        shift_left(3);
    }

}

void delay_10ms(int t)
{
    for(int i=0; i<t;i++)
    {
        __delay_ms(10);
    }
}

void shift_right(int a)
{
    for(int i=0; i<a;i++)
    {
        lcd_cmd(0x14);
    }
}

void shift_left(int b)
{
    for(int i=0; i<b;i++)
    {
        lcd_cmd(0x10);
    }

}

void string_display(char *p)
{
    while(*p!=0)
    {
        lcd_data(*p);
        p++;
    }
}

void lcd_init(void)
{
    TRISC=0;
    TRISD=0;
    en = 0;
    rw = 0;

    LCD_out = 0;
    lcd_reset();
    lcd_cmd(0x28);
    lcd_cmd(0x01);
    lcd_cmd(0x0C);
}

void lcd_reset(void)
{
    __delay_ms(20);
    LCD_out=0x03;
    en=1;
    __delay_ms(5);
    en=0;

    __delay_ms(10);
    LCD_out=0x03;
    en=1;
    __delay_ms(5);
    en=0;

    __delay_ms(1);
    LCD_out=0x03;
    en=1;
    __delay_ms(5);
    en=0;

    __delay_ms(1);
    LCD_out=0x02;
    en=1;
    __delay_ms(5);
    en=0;
    __delay_ms(5);
}

void lcd_cmd(unsigned char cmd)
{
    rs=0;
    unsigned char temp;
    temp=cmd;

    //sends the upper four bits
    temp=temp>>4;
    LCD_out=temp;
    en=1;
    __delay_ms(1);
    en=0;
    __delay_ms(1);

    //sends the lower 4 bits
    temp=cmd;
    LCD_out=temp;
    en=1;
    __delay_ms(1);
    en=0;
    __delay_ms(1);
}

void lcd_data(unsigned char data)
{
    rs=1;
    unsigned char temp;
    temp=data;

    //sends the upper four bits
    temp=temp>>4;
    LCD_out=temp;
    en=1;
    __delay_ms(1);
    en=0;
    __delay_ms(1);

    //sends the lower 4 bits
    temp=data;
    LCD_out=temp;
    en=1;
    __delay_ms(1);
    en=0;
    __delay_ms(1);
}