Liv's younger, but I've notice this for a while. She separates all her food and will eat one by one. Her toys are the same way. If I move something she'll take it and place it where it was. I think it's normal, like someone said it's all about controlling their environment. She doesn't seem to like long sleeves anymore either, she'll rip her shirt right off! Which does worry me as I've got mild OCD and her father has full on OCD, like I couldn't touch one arm without touching the other or he'd go mental. But her doctor says it's normal at this age.
If it really worries you, you might want to have a chat with her doctor. x