End of round map change?

[sub7]

When a player gets his knife kill and the leader board comes up indicating the round is over, a message appears saying the next map has been set to gg_hextower, strangely this map doesn't appear at the top of a mapcycle or maplist, nor is it the first alphabetically... why does this happen? It's always the same map.

It doesn't happen when I set the next map in mani-admin, but it does bypass gungames next map vote system. Any ideas?