I might repeat somethng but it's not because of a disorder (that I'm aware of...). I will repeat an answer sometimes to simply draw out the conversation a wee bit. Because if I had my druthers, when someone asks me a question, my tendency is to simply answer them and immediately continue walking on.
So someone would say "It's a beautiful day out here today."
And I would answer "Yep, yep, yep. Sure is." The yep, yep, yep is just to string the conversation of for just a weeeee bit longer. To be a little more polite, Otherwise I'd just have responded "Sure is." and kept walking. My response would have lasted 2 seconds. So at least with the yep, yep, yep I'm giving them a 10 second response instead of a kiss-my-ass response of "Sure is."