Hey There,
It’s a confirmed bug, we’ve already patched it and it’ll be in the next release.
For now, find this code:
$text = ( 0 === $number ) ? 'Leave a Comment' : _n( '%s Comment', '%s Comments', $number, '__x__' );
and replace with
$text = ( 0 === $number ) ? 'Leave a Comment' : sprintf( _n( '%s Comment', '%s Comments', $number, '__x__' ), $number );
If you still have issues after updating that, open a thread in the forum and we’ll be right along to assist. 🙂
The theme update 4.5.2 should fix it.
Thanks!