Some things to test

I don't know why you guys are doubting my experience since I've been very specific about what happened. There was no position glitching. The dragon was near its original spawn point. It didn't suddenly move during the skill for whatever reason. I aimed at the center of the dragon. Absolutely nothing strange happened during this event except that the dragon was just starting to lift off to perform its ice breath attack as the meteor was falling, causing me to miss. The only possible explanation for my experience is that Meteor doesn't hit dragons while they're flying, even though most other magic can.