Nutrients overdose ?

This looks like normal change to flower. The new growth will be really light green at first. Check out both my diaries at week 5

agreed with Nutrient lock could be Ca or P excess (should check ur ppm) symptoms of light burn is different

Looks to be Nutrient lock out possible have you checked runoff?

Sometimes when they are switching to flowering all sorts of changes are occuring and this might be that but more so it seems to me that they are getting burned by the light as I see only tops a bit dried and the seem like they want to get away from that stress. Heat or too much ppfd in combo with not enough air movement.

Start to change the nutrients , she needs less N Nutrient. Give them little bit of cal/mag and thats how it works , if u got claws , flush it with good ph water ! Happy 420 :)

chlorosis on new grwoth with skinny leaves forming.. could be too much p or k. not enough info to give a good answer. no idea if soilless or soil or info on nutrients provided... depending 100% on what is visible on leaves leads to a lot of false positives If those are the tallest points in canopy in center, could be slightly too much light, too. This can happen slowly or fast depending on severity. this would explain the droopiness too. watering habits .. most people water wrong. fully saturate, wait for appropriate dryback, reapeat... you don't choose teh volume nor the time increment. it should be a reaction to what you observe and you use as much water as it takes to accomplish the task. 10% runoff religiously, if soilless.

No ec dmg on the tips so your salts are within range, 😉 slightly wrinkled leaves drooping slightly, more water is going up than out, RH% spiked recently? The generalized lime greening all over with no obvious starting point is normally a indicator of high pH. A little too much calmag possibly? Not sure as there is no feeding schedule on your diary. Ph would go a long way to telling me what's going on. Make sure it's not getting high RH overnight. She is not uptaking as well as she was before, chloryphyll is having hard time replenishing. Rather she is photosynthesizing faster than she can replenish chloryphyll possibly because wayer cycle has slowed to a grind for some reason. PH skew likely causing uptake problems and/or high rh in air or over saturation of medium. Bit if it was oversaturation in medium I'd expect hypoxia dmg too. Leaning towards pH skew.