Try this, based upon differences between your code, and the renderer for Minecraft chests.
public void renderTileEntityAt(TileEntity tileentity, double x, double y,double z, float f) {
GL11.glPushMatrix();
GL11.glDisable(GL12.GL_RESCALE_NORMAL);
GL11.glColor4f(1.0F, 1.0F, 1.0F, 1.0F);
GL11.glTranslatef((float)x + 0.5F, (float)y - -1.5F, (float)z + 0.5F);
GL11.glRotatef(180F, 0F, 0F, 1F);
bindTexture(texture);
GL11.glPushMatrix();
model.renderModel(0.0625F);
GL11.glPopMatrix();
GL11.glDisable(GL12.GL_RESCALE_NORMAL);
GL11.glColor4f(1.0F, 1.0F, 1.0F, 1.0F);
GL11.glPopMatrix();
}
It's most likely the normal code that is your issue.