Advanced dragons 2 on Minecraft keeps not having dragons

I bought a pack in Minecraft called advanced dragons 2 and the pack is glitch and every time I get a dragon in the game the dragon literally hatch a desk or a table please help me the pack I bought it and spent money on it to find out why all of the dragons aren't even dragons the game is called " advanced dragons 2" and it's a pack that is in Minecraft and in the photos it shows that the "dark dragon egg" became a wizard like what