Newest growth on plant curling up?

Hi guys uve definitely heard this one before but i just need some reassurance, 1 of my 3 plants has randomly started to slow growth and curling up on very top of the plant, but my other two are perfectcly fine, i transplanted the other 2 plants a week after i transplanted this one, and when i topped them i noticed a significant stunt in growth by the one thats curling up compared to the others, they were all topped at the same time, the last 2 photos are a different in the rate of growth with the 2 new tops
 

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