Sort of the same thing w/ my 1200 Sport (and my buddy and I were the ones who installed the center stand, back in 2010.) As I recall, the loose left side bolt contacted another part of the bike, telling me there was an issue. Lucky for me, there was no topple over. We should most likely have used some sort of thread lock when installing the center stand, though it didn't come loose for several years and several thousand miles ..... I mean, a bunch of miles!