@marktheman,
Facebook, likely, doesn't give a damn about your group. Sorry, but it's true - they have less than 10,000 employees to cover over 1.6 billion users. You do the math.
So it's something else. Could one of your fellow administrators removed you from the group? What happens if you leave the group and then rejoin it? Consider those kinds of remedies - but Facebook is not going to do that even if you're briefly in 'Facebook Jail'.