Just like what shows in the attached screenshot, the names of the 2 sliders in the bottom are not in the center of the slider.(In Traditional Chinese.)
I also checked some other languages including Simplified Chinese, and this issue was so far only happening in Traditional Chinese. I'm not sure if there's any other language got this issue though.
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If you haven’t, For security and stability reasons, I would strongly suggest you update your Java to the latest version (1.7.0_65): http://www.java.com/en/download/.
When using a 32-bit browser on a 64-bit operating system the automatic version detection will only show the 32-bit version of Java, the 64-bit version needs to be downloaded manually: http://www.java.com/en/download/manual.jsp.

I did updated. Thanks for the reminder.

Fixed, maybe by fix for MC-23952
Still in 14w31a.
Though it's not really affecting anything but my OCD. 😛