Why are those leaves damaged?

ok lets talk about your plant, and then about flushing Your plant is totally nice and green and the pistils are fully white, she looks like she would flower for 3-4 more weeks wait until leaves are changing to autumncolors// fading out.... pistils are orange at 75 percent at least and trichomes look at them with a magnifier, and they got to be milky at least... to have potential Ich would check the distance to the lights too... because the last 5 cm of the flower grows alittle weirted, nearly like reveg ( but some strains grow like this and yes flushing.... Flushing is a modern myst...... i let you the link to a study here and one for ready to harvest plants https://www.growweedeasy.com/ready-for-harvest-pictures https://www.rxgreentechnologies.com/rxgt_trials/flushing-trial/