It happens because your brilliant mind gets so caught up in the idea of explaining your thoughts to somepony that you forget how much you are really writing. And after you show all your ideas they appear in a miraculous cloud and brick of text that is your thoughts.I really wish I could think as well as you, maybe instead of wishing I look at what I am good at...
I need to figure out my cutie mark, I've been thinking, I think it's being a paper editor since I can't spout my ideas in a comprehensive idea but I can fix other ponies's writings and help their thoughts. Sorry I'm not on topic, just thinking.