[Bullet]Target does not render properly if progress is smaller than target

[Dr. Cher Han Lau]

$('.sparklines').sparkline([200,100], {type: 'bullet', barColor: 'green', width:'104px', height: '30px', targetColor:'pink', targetWidth:'3', rangeColors:  ['red','green', '#22f'], performanceColor:'#7cb5ec'});

When I use the code above, the target bar does not render as settings. This only happens when progress is smaller than target, Is this an intended behaviour?