We don't normally run 3 battle groups when doing war, we normally stick to 2 always have but ever since this update to war it seems to have opened up a 3rd battlegroup and has put us up against an alliance who also uses 3 battlegroups.
Is this a bug or have we set this up wrong? As you can see in picture 2 battlegroups option is selected but the confirm button does not work, I assume this means this option is currently selected as when switched to 1 or 3 battlegroups it allows us to hit confirm..

As for this second picture this is our current war groups we only have 2 active ones going while battlegroup 3 is just sat there empty?