This is an important question. You did nothing wrong, they'd like to hire you, but there was just something about you that made them hesitate. And because they

This is an important question. You did nothing wrong, they'd like to hire you, but there was just something about you that made them hesitate. And because they have a ton of candidates for very few jobs, that hesitation means moving on. But it's NO knock on you - it's just some tiny thing that they probably should have ignored, but because they're focused on making a decision, they'll use any excuse to eliminate you. Don't think another second about it.