popular polls load on server

We have a pretty popular poll/vote contest running using this plugin. However, we're seeing a lot of records pulled from database with this call:

SELECT filtered.sort, l.*, d.field_number, d.value
FROM wp_rg_lead l
INNER JOIN wp_rg_lead_detail d ON d.lead_id = l.id
INNER JOIN
( SELECT @rownum:=@rownum + 1 as sort, id
FROM
( SELECT distinct l.id
FROM wp_rg_lead l
INNER JOIN wp_rg_lead_detail d ON d.lead_id = l.id
WHERE l.form_id=11
AND status='active'
ORDER BY date_created DESC
LIMIT 2200,100
) page
) filtered ON filtered.id = l.id
ORDER BY filtered.sort

Is this by design? Seems like a lot of extra data being pulled out. Is there a way to optimize this call? here's the live contest:
http://www.canadianfamily.ca/contests/teacher-awards-voting-phase/

Thanks

Indeed, seems we're talking about the same issue here: http://www.gravityhelp.com/forums/topic/poll-results-different-on-front-end-than-from-back-end?replies=1#post-340278

Another thing to note is that we've noticed a strange behavior, that seems beyond using cache, because we've documented the results being smaller than those shown on backend, then at some point they got almost accurate when they went up, and then again we've seen them go back down. I've tried and tried to figure this out but I'm out of clues.

Please respond to this ASAP