If i had to guess, id say underwatered due to the leaf cells looking flat. You would have saggy plump full leaf's if you were over watering. The burt tips could be a slight nutrient burn from excess nutrients built up in your underwatered soil. If your pot is fairly light to pick up, i would then mix a low dose nutrient watering at proper PH. Like cut it down to 1/4 of reccomend, and water slowly till you have "runoff". Then continue as planned. Hope this was of some help to you. ✌️🏼 feel free to PM me with any more questions