Very well! I made some "guide" for this bug. I didn't add the map position because pretty much all adventurer guild is at same position...but here it is: Placing the character at Upper Decks (7,5) will also cause him to appear at Lower Decks (7,5).

Here i placed my alt character (Yoli Deleene) at bug position and used my another account character (Akbaba Rarab) To Screenshot the points. I also added some map marksers at screenshots.

http://i238.photobucket.com/albums/f...uff/bug001.jpg

When i go to stairs to zone to lower decks map, there is Yoli again. She was still sitting at same spot as the first screenshot when this one was taken.

http://i238.photobucket.com/albums/f...uff/bug002.jpg

Now a suggestion of how to see it on the fly. Place a character where Akbaba Rarab is at 3rd screenshot...

http://i238.photobucket.com/albums/f...uff/bug003.jpg

...and just walk with another character at the marked area at 4th screenshot. (as close as possible of wall...the closer you are and slower you pass (walk is the best option) better chance of also seeing the character walking in front of the character placed at 3rd screenshot position).

http://i238.photobucket.com/albums/f...uff/bug004.jpg

I believe its pretty much the same bug which causes characters to walk inside roof/floor at dungens and that causes antlings from lower floor at Copperbell mines to also appear near its entrance. It might look like a harmless bug, but it can be exploited to kill monsters that do not react, like copperbell antlings...you can attack them when you see them near entrance, but they won't react because they actually are not in that map so you're always outside its aggressive range and outside its territory.

Hope these screenshots help! ^^