I don't see anything strange in the voting patterns if one accepts the reality that there is organized voting. Orlando had friends that were voting - hoping to help him - and that's what OurStage wants to encourage. When there's a wave of organized voting, you should expect to see shifts in standings. Unfortunately, because voters may not have the opportunity to help their artist by voting for that artist, they may choose to vote against artists who they feel may be competitive. I doubt that happens to artists near the bottom. If anything, negative voting helps them because I would think the logical negative voters would vote for songs at the bottom of the competition over the songs that they think or know(because of the song's current standing)would compete well against their favored artist.
Then there are song submissions like this, that are just for fun: http://www.ourstage.com/music/channel/114-male-singer/DIGWBCZLSNHE-easy-on-the-eyes
It'll be good for a laugh for two weeks. I'm surprised that it has jumped halfway up the competition since Friday. I'm glad to see the voters in Male Singer/Songwriter do have a sense of humor. Most of the songs there are deep and serious.

http://www.soundclick.com/Summeoyo
http://www.ourstage.com/profile/summeoyo1