I recently witnessed an another interesting thing. I checked my account status on steemworld.org and found that two users have downvoted my several posts. Those accounts @a-steemdefleague and @a-cmsidl just opened on 9th of May and right from the beginning started to downvote many users till their voting power ended. I wrote about them in my post two days ago. I also checked the accounts they were following or were followed by and found many of them doing the same thing. However, they also started upvoting and resteeming some users' post while still downvoting their targeted users. Most of their followers or whom they are upvoting are spammers.
Though their downvote doesn't make a difference but it irritates me and I think other users are feeling the same thing. I request you to check their activities. They are bots and doing naughty things.