In the picture there are three plants, plant one was added to the flower tent later than the other two, plant 2 has had minimal trimming of lower leaves (flowering nicely), the third has been trimmed to clear the canopy effect, this has effected bud production, will continue to monitor the difference between trimmed and untrimmed.
Control the cuantity of water. I think you put too much . How many ml do you use on each irrigation? The distance between nodes are too big, this appears when you put more water than necessari. sorry for my english 😓