There is no meaning to it. Our brain is complex, and sometimes things don't go as they supposed to. Life's a lottery, and sometimes you win some shitty impediment. We suffer under our stutters, which makes us feel small, powerless and helpless, which strengthens our stutter, which makes us suffer more, which makes us even feel smaller more powerless and helpless... It's a vicious cycle you need to work on vigorously for it to stop.