Is it possible that when the bud was forming and opening you turned the plant a different direction from it's light source?

Thanks for the picture, that always helps tremendously. Yes it does look like you've turned it in another direction. It has just confused the plant, you've done it without meaning too, it's easy to do. Next time that plant starts a spike; make sure it's always pointing in the same direction,hopefully that should do the trick. gb

Ah, you both are probably right. There has always been a T5 above the zygo, but I do believe it may have been turned so that the spike was once on the left (when looking at the plant) and is now on the right.

Sarah