Vines see through one way and normal the other way.

(First time doing this so I am not sure if I am doing it right or not.)
Not sure if it is the new snapshot (14w08a) or my Mac but it seems when I look at vines one way it goes see through an when I look through them the other way they come back and can see them again.
If it is my computer, is it possible to tell me what is wrong.
All so, I googled see if anyone else has had this problem and couldn't find any. If someone has reported this sorry for you time. I have also tried to make this clear as possible also including some photos.
Thanks.