Gameboy Development Forum

I'm having issues getting my metasprite to move to the right. It has no issue with going to the left, and even animates correctly when moving to the left. However when moving to the right it locks up and refuses to move to the right. The first time the right arrow is hit the sprite moves right then back left immediately. Can someone take a look at my code below and see if I am missing something? I copied and pasted the code, so I don't think I have a typo there or an error in the logic.

#include <gb/gb.h>
#include <stdio.h>
#include "spirit.c"


void main(){
   

   int x = 55;
   int y =136;

   SPRITES_8x16;spirit);
   set_sprite_tile(0,0);
   move_sprite(0,x,y);
   set_sprite_tile(1,2);
   move_sprite(1,x+8, y);
   SHOW_SPRITES;

    while(1){

        if(joypad==J_RIGHT)
        {
                x + 16;
                scroll_sprite(0,x,y);
                scroll_sprite(1,x+8,y);
                delay(10);
                set_sprite_tile(1,2);
                delay(10);
                set_sprite_tile(1,6);
                delay(10);
                set_sprite_tile(1,2);
                delay(10);
        }
               
        if(joypad==J_LEFT)
        {
                x - 16;
                scroll_sprite(0,x,y);
                scroll_sprite(1,x+8,y);
                delay(10);
                set_sprite_tile(0,1);
                delay(10);
                set_sprite_tile(0,4);
                delay(10);
                set_sprite_tile(0,1);
                delay(10);
        }


    }