Barneys Blue Cheese 1st grow (week1 flower)

okay so today i checked on the clones and i saw that 1 of them was REALLY droopy!
the other 3 are fine but this 1 is just lifeless... the colour of the leaves has not changed at all it is just very limp.
i have since moved the lamp i had above them and they are now under the shade of the mothers.
i have included a picture of the 2 clones from the same mother on ther own and as u will see her sister is looking very healthy.

does any1 have any idea what is wrong??

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