It is typical for SB. I would diagnose it as a form of Attention Deficit Hyperactive Disorder.
What happens is they get excited about rearranging their stuff, they put a ton of time into organizing things into the most optimal state they can, and just moments before they finish, something shiny attracts their attention and their focus abruptly and happily switches to the new idea.
Their efforts are so amazing in other quarters that we tacitly agree to tolerate it.
Just as in the USA, if you have ADHD here you can ask for extended time to take tests and get other benefits designed to level the playing field.
Have some compassion fer cripes sake.