Do i need to worry?

no idea what your feeding them. most things in the organic range need time to breakdown and become available in the medium. I would suggest looking at the package on the nutrients your using and follow its directions. For liquid feeds it tends to be once or twice a week, for amendments its about one every 3-4 weeks and it need to be mix in a week before its ready.

Yes for sure worry. This will spread across your plant extremely fast like only a few days. Garentee 99% it's the soil ph is off and most likely to acidic peob down below a 4.5. You can flush soil with tap water of tap ph is around 7 to 8.5 or so. The plant is getting lockout from the soil ph being

Plant lacking flower nutes, taking it now from leaf storage and you want to demolish that warehouse. Sort problems first, then do trainings.