It could very well be a glitch. I've had it happen where one or 2 people wouldn't show up as having tickets. Try refreshing the page or log out and log back in. If after a few attempts, you can wait a day or 2 for it to show up or call WDW back to confirm your reservation. Have them email you a confirm. If it's showing up right on the email, chances are you're good and it'll just take a while for
MDE to catch up.