Weird texture of redstone.

Ok this is what i did. I had the world originally made for 14w31 something
and i got had used it for 14w33d and now this morning i got the new version. all i did was put a villager on top of it, removed it and then it doesn't even show it going up the block. I don't really know why this happened :/
So thanks i don't know what this glitch was for, like it was perfect wired, working machine. didn't really test it, if it helps what it does is when you press it the redstone poses the command block this was the command i used
/give @p cake
its on single player.