I don't put a lot of stock in the result screen because most of the time it's just a visual bug. I doubt there were that many unless on the replay you can see that many planes. I have that quite often but when you watch the replays (Which aren't perfect either) you only see the 3-5 planes that a person can have. But yes never that many, usually 6-8 is the bugged number I've experienced.
If it were 17 planes than you would made quite a few crowns on that defense.