comments rating - vote count increased by 2

Hi,
My aim is to place fivestar on top of each node. It should show an average rating of users that voted by submitting and rating with their comments.
My setup:
-Create content type article
-Add field rating with fivestar widget - display set to "rated while viewing" + Show average count
(I found out that, "rated while viewing" must be set up because that is the only way the widget would show average count)
-Rating field using tag "rating"
-Add the same rating widget to show on comments - display set to "rate while editing" +show user's vote
-Voting target set on "parent node"
Rating field using tag "rating"

For testing I enabled voting API Anonymous vote rollover - immediately

Each time after submitting a comment, the count increases by 2. However, the average number is counted ok.
This happens with admin approoval turned on and off as well.

Would it be possible to show only average count without possibility to vote? I want visitors to be able to vote only upon submitting a comment.

Thank you for advice