OpenGL / SharpGL WPF - wpf

Question

Situation: using the Instantiate Sprite() method I load the texture into memory, then in the DrawTexture() method I unload it to the scene. But why is it that when I load the second texture onto the scene, it replaces the first one?
First sprite render
After add second sprite
private uint objTex1;
private uint objTex2;
private List<Bitmap> _textureImages = new List<Bitmap>();
private List<float> _texturePostitonX = new List<float>();
private List<float> _texturePostitonY = new List<float>();
private List<float> _textureScaleX = new List<float>();
private List<float> _textureScaleY = new List<float>();
public void InstantiateSprite(Bitmap sprite, out int textureReferenceId)
{
gl.Enable(GL_TEXTURE_2D);
int index = _textureImages.Count + 1;
textureReferenceId = index - 1;
_textureImages.Add(sprite);
if (_textureImages.Count == 1)
{
uint[] _texturesNew1 = new uint[1];
gl.GenTextures(0, _texturesNew1);
objTex1 = _texturesNew1[0];
gl.BindTexture(GL_TEXTURE_2D, objTex1);
}
else
{
uint[] _texturesNew2 = new uint[1];
gl.GenTextures(0, _texturesNew2);
objTex2 = _texturesNew2[0];
gl.BindTexture(GL_TEXTURE_2D, objTex2);
}
gl.TexParameter(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
gl.TexParameter(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
gl.TexParameter(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
gl.TexParameter(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
var bits = _textureImages[index - 1].LockBits(new Rectangle(0, 0, _textureImages[index - 1].Width,
_textureImages[index - 1].Height), ImageLockMode.ReadWrite,
PixelFormat.Format24bppRgb
);
gl.TexImage2D(GL_TEXTURE_2D, 0, 3, _textureImages[index - 1].Width, _textureImages[index - 1].Height, 0,
GL_BGR_EXT, GL_UNSIGNED_BYTE,
bits.Scan0);
gl.BindTexture(GL_TEXTURE_2D, 0);
_textureImages[index - 1].UnlockBits(bits);
}
public void OpenGL_DrawLoop()
{
gl.Clear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
for (int i = 0; i < _textureImages.Count; i++)
DrawTexture(i);
gl.End();
gl.Flush();
}
private void DrawTexture(int idTex)
{
gl.PushMatrix();
gl.LoadIdentity();
gl.Scale(-0.15, 0.28, 1);
gl.Rotate(180, 0, 0, 0);
if (idTex == 0)
{
gl.BindTexture(GL_TEXTURE_2D, objTex1);
}
else
{
gl.BindTexture(GL_TEXTURE_2D, objTex2);
}
gl.Begin(GL_QUADS);
float dist = 10;
gl.TexCoord(0, 0); gl.Vertex(_textureScaleX[idTex] * (-1 + _texturePostitonX[idTex] / dist), _textureScaleY[idTex] * (-1 + _texturePostitonY[idTex] / dist));
gl.TexCoord(1, 0); gl.Vertex(_textureScaleX[idTex] * (1 + _texturePostitonX[idTex] / dist), _textureScaleY[idTex] * (-1 + _texturePostitonY[idTex] / dist));
gl.TexCoord(1, 1); gl.Vertex(_textureScaleX[idTex] * (1 + _texturePostitonX[idTex] / dist), _textureScaleY[idTex] * (1 + _texturePostitonY[idTex] / dist));
gl.TexCoord(0, 1); gl.Vertex(_textureScaleX[idTex] * (-1 + _texturePostitonX[idTex] / dist), _textureScaleY[idTex] * (1 + _texturePostitonY[idTex] / dist));
gl.PopMatrix();
}
While the code is written with the ability to render only two textures, then you can add it