+ I create a poll for threads domain.com/threads/topic.123/ with 5 poll responses (poll_response_id: 1, 2, 3, 4, 5) .
+ Then, I edit this poll to remove 3 poll responses (poll_response_id: 1, 3, 5).
+ But after that when I access to old link: domain.com/threads/topic.123/poll/results?poll_response_id=1 or 3 or 5, it's return "Error : You do not have permission to view this page or perform this action."
+ And In Google Webmaster Tool, I got so much 403 error.
I think after we delete poll responses, it must to return 404 to notify with crawler it had deleted.
P/s: Xenforo use too 403 header, it's not good for SEO.