Please upgrade to 2.2 here.
The 2.0 and 2.1 branches are no longer being updated.
Voting plugin shows answer tab twice
This discussion is related to the Voting
I saw the duplication of answer tab in here, sometime.
I couldn't found 2nd tab in HTML source, so I'm not sure but guess maybe it's AJAX thing.
Yes, it's not a critical. Just reload and fixed. but It's better updating 1st tab than adding 2nd tab.
I am using Firefox 3.6 on WinXP.