Possibly too much light intensity. I'm guessing that the roots were damaged, the plants were subjected to transplant shock and had less ability to take up water. With the reduced water, less transpiration could take place to help cool the leaves. And with the addition of the new lights/bulbs, the increased light intensity has put the plants in a state of stress.
The fact that the un-transplanted seedlings are unaffected clearly point to a physiological stress that happened during and directly after the transplant.
Raise the lights up and keep the growing medium's wetness as even as possible. Hopefully the plant's root systems will recover enough to alleviate any issues with the new growth going forward (though the old, twisted leaves likely won't straighten and could even die off).
By the way, what type of lights (LED, T8, T5, etc.), how many of them, and how close were they to the tops of the plants?
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