Thanks for the bug report, I was aware of maps coming up twice in voting and I think this was a bug due to some internal changes I made, I'll be fixing this soon.
Also for being able to place blocks in mob, I had disabled this because it allowed people to use blocks (such as TNT) to climb out of maps, or hide from mobs in some way, so I think it might be best to remove the TNT from these maps. If you have any good reasons to change this, then I'd be open to making some changes however.