What diary/grow are you asking about here... I would need to see what you've been doing/feeding and various other pieces of information... it's definitely a calcium deficiency but if I knew the diary, I could tell you why you've got it and what to do about it (and it doesn't matter that the other plants don't show the same signs - each plant is an individual and will react in their own way).
I'll try to check back here to see if you've put in a link... thanks...