OCD can be manifested in many ways.
Constantly washing your hands.
Constant rechecking of things such as is the door locked or checking to see of the iron/stove/etc was turned off.
In James it seems to be everything has to be lined up.
My sister has the door checking thing and believe me, it is real.
When she leaves her house, it takes her ten to fifteen min to make sure all the doors are locked. All two of them. She turns on the handle, pulls/pushes on the handle, leans on the door. And this is for both doors and usually not just once. It drives me crazy, but you can not stop her.
Except for that door obsession, she is perfectly normal and unless you had ever seen it happen, you would never guess.