I checked, and this is normal.
The server needs at least one person to log in to start loading the strategus battle, anyone who connect to EU_3 (when its in duel mode) will load the strategus battle right away
(if there is one waiting in queue).
This "bug" is not a bug, its just because there is very few people playing and doing what everyone did before: stay logged on EU_3 before the battle starts, in anticipation of what is going to happen.
I just joined EU_3 and it instantly kicked me and loaded Habba map.
Then, afaik, a few minutes after if noone is in the battle, defense auto-wins.
But if noone logs, battles will stay queued forever, and possibly delay the future queued battles.
So try to log in to EU_3 the next times and tell me if it solved the problem.