Problems about CCLabelAtlas on Retina

The problems only arises in Retina.
When in Retina, CCLabelAtlas sometimes will display wrong. If the string is “1”, it will show up “12” which means that CCLabelAtlas may incorrectly cut out the texture.
there are some discussion on stack overflow but no one give the answers.
Can somebody tell me how to solve it? Thank in advance.

please help.