Auto Pounder with Cheese (Juicy Lucy)

The top 3 colas are experiencing major leaf curling. I'm not sure why this is because they're all under the same lights. At first, it appears that the issue was due to over-watering, but it really isn't the case since the curled leaves are primarily at the top and they feel dry to the touch. If this continues, it will seriously hinder the yield so I'm hoping to turn this around soon. I just gave her a feeding last night, as well as rotated the amount of direct light on those particular colas. If anyone knows why this would be happening please let me know so that I can correct this ASAP.