bleed bug when drawing rectangles with RayLib

bleed.c

#include <raylib.h>

#define MAP_SIZE 64
#define TILE_SIZE 8

static int map[MAP_SIZE][MAP_SIZE];

static Color mappedColor[] = {
    {255, 0, 0, 255},
    {0, 255, 0, 255},
    {0, 0, 255, 255},
};
#define GetMapColor(c) mappedColor[c]

void Render(float dt)
{
    ClearBackground(BLACK);

    for (int x = 0; x < MAP_SIZE; x++)
        for (int y = 0; y < MAP_SIZE; y++)
            DrawRectangle(x * TILE_SIZE, y * TILE_SIZE, (x + 1) * TILE_SIZE, (y + 1) * TILE_SIZE, GetMapColor(map[x][y]));
}

void CreateMap()
{
    for (int x = 0; x < MAP_SIZE; x++)
        for (int y = 0; y < MAP_SIZE; y++)
            map[x][y] = GetRandomValue(0, 3);
}

int main(int argc, char **argv)
{
    InitWindow(800, 600, "Bleeding");
    SetTargetFPS(60);

    CreateMap();

    while (!WindowShouldClose())
    {
        float dt = GetFrameTime();

        BeginDrawing();

        Render(dt);

        EndDrawing();
    }

    CloseWindow();

    return 0;
}