People with this type of OCD have an obsessive fear of certain objects lacking symmetry. These people spend a lot of time in activities like folding clothes or stacking them. Even if one cloth from the stack is lurking out, they will do it all over again. If they get their one hand wet, they will intentionally wet their other hand too.
Some common symptoms are
-Checking the lock multiple times
-Counting the steps when they walk
-Counting the tiles on the wall
-Perfectly arranging things with the same between each one of them.