What is the logic behind the sorting of topics within a question?

Whenever I look at the topics listed under one of my questions, I cannot figure out how they ended up in their current order. They are not:
– in the order I listed them
– alphabetical
– ordered by the number of people with that topic
– ordered by the number of questions with that topic
– ordered by the length of the topic’s name

So, how does Fluther decide how to order the topics? It seems like a random ordering would be counterproductive (why write the code to order them randomly when the order in which they are originally input is essentially random). Other than that, I’m out of ideas.

Are they just trying to drive the OCD among us crazy?