imbalance in nutrition... or ph is off
nutrients are commodities.. not really much stratification. some different ways to deliver nutes and some require microbes to help break things down, but they should all be 'high quality' and cheap in price. I pay 4 cents per for gallon fertilizer.
The symptoms underneath wouldn't be caused by light. However, the top couple nodes look tight... if the node spacing got tighter (relative to new growth), reduce light or increase distance. Kinda hard to assess that with this picture. Some look like 2-3 nodes all congested, but as long as they continue to spread out a healthy distance all is well.
pH is possible but i'd lean twoard n-deficiency as pH imbalance would normally cause more than 1 symptom.
Is VPD sky-high? I don't know where the 'line in the sand' is, but you get up near 2kpa VPD for too long and a plant will stall out...