Director Graves is clumsy. Everyone knows it - the newbies, the seniors, even the people who've probably never even met him. There hasn't been a day gone by in MACUSA where Graves hasn't tripped over something (or nothing), spilled his drink, dropped a stack of papers... the list goes on. In fact, the only times he's ever NOT clumsy is when he's duelling or when he's out in the field (as having people's lives on his shoulders instead of just paperwork keeps him steady and in control).
As a result, the Auror department and MACUSA at large gets very, very suspicious when it... stops. When, suddenly, Graves is coordinated and almost /graceful/, acting like it took no effort or thought to avoid slamming into Betty from Potions Analytics by lifting the stack of reports he'd been reading and side-stepping around her before walking right off again still reading them. In fact, its so out of character, they start to wonder...
Percival Graves is a klutz & Grindelwald didn't account for that
As a result, the Auror department and MACUSA at large gets very, very suspicious when it... stops. When, suddenly, Graves is coordinated and almost /graceful/, acting like it took no effort or thought to avoid slamming into Betty from Potions Analytics by lifting the stack of reports he'd been reading and side-stepping around her before walking right off again still reading them. In fact, its so out of character, they start to wonder...