a strange thing for comment votes

Правка en1, от Los_Angelos_Laycurse, 2016-04-27 14:48:10

I have test to give some upvote and down vote for zero vote comment, but soon a lot of them get back to zero? What's wrong??

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en1 Английский Los_Angelos_Laycurse 2016-04-27 14:48:10 157 Initial revision (published)