MULTIPLE Ender Dragons on 1.12.0

On my survival world, (pocket edition) on normal mode, I went to the End, and I at least saw 4 Ender Dragons. This is completely insane and not doable by only 2 players.. You can see in the files I attached there are 3 health bars, but I counted at least 4 or 5. My sibling and I won't be able to kill 4 or even MORE ender dragons, so until this gets fixed, we won't be going to the End again!!