Command Blocks Giving Me Redstone Blocks

Okay so in the command block, if I use normal commands they work fine, but if I use longer commands like the furniture command: http://www.ijaminecraft.com/cmd/furniture/
or the custom player statue command:
http://statue.jespertheend.com/
all that happens after I press the button is I get a redstone block placed on top of the command block, and this worked for others when I saw them on YouTube, but when I try it, it won't work.