Hope hadn't noticed this peculiar quirk of Light's until recently.
Whenever something was slightly out of place, and we're talking the tiniest bit out of place, she would make an effort to fix it and put it back in place. It was as if everything had a certain position and a certain way it was meant to be, or a certain distance things were supposed to be from each other. When they weren't, she wouldn't make a big scene about it, but she'd get a bit annoyed. As if to say, "How could you not be bothered by this?"
It was a clear case of OCD.
He hadn't expected that from a former military sergeant. Also considering how Lightning was. She wasn't afraid to get her hands dirty and do what needs to be done— and he's seen this first hand back on Cocoon; monster guts were definitely not easy to clean off— so for her to be irked when things were out of place was ironic, to say the least.
When he had asked her about it, Lightning only blinked, pausing what she was doing to think.
"I never noticed. Do I really do that?"
"Yup. I mean, it isn't a bad thing. It's kind of cute."
She rolled her eyes, reaching a hand out to adjust his collar back in place.