Each time I break a block, the block gets destroyed, but the image continues there for a couple of seconds. And when I place a block, the block appears, but it is invisible for a couple of seconds, then, the texture appears.

1. Just get a block.
2. Place it, and you will see that it needs some time to appear.
3. Then, try to destroy it.
4. You can see that the block get destroyed, but the image is still there. YOu can even go through the image.