sizam46answered grow question 2 months ago Hello from Russia. I'm sorry if I make cultural mistakes and use slang from my country. There is little initial information, so I will judge only by the photo:
I suppose the reason lies in the following:
1) The proximity of the light source. Pay attention to the fact that it is mainly those areas that are located close to the light that suffer. This is not too critical, but watch carefully: if the plant does not recover from stress after 2-3 days, think about the problem.
2) Where is the fan located? If it blows precisely on those areas where your leaves are bad, remove it. My fan is always directed at the lamp, I have not used it as a plant blower for many cycles.
3) Aren't you feeding her too much nitrogen?