Missed a 'quit' there I think.
There aren't enough players, so not enough Alliances, so the match-making parameters are very wide because if they tightened them to get fair match ups, you'd have the War equivalent of 'No Opponent Found' or in WW case, 'War search as been running for 4 days now and nothing'
Or in your case, the chances of another 15v15 with 3GP, 2EA, 3GA, 7IA is precisely zero, so they tossed you in with the first 15v15 that popped up.