Please upgrade to 2.2 here.
The 2.0 and 2.1 branches are no longer being updated.
[Voting Addon] Bug: Can vote more then once on post (Is this being maintained?)*
This discussion is related to the Voting
Any "answer/thread" we call it post/topic etc
Anyways it allows duplicate, but on discussions view like on here, you can only vote it once.
Sorry if this is duplicate