It's always fun when one plant is just different, it's most of the time just genetic differences, but there are exceptions. Have a look at air intake on your tent, sometimes there is just slight dead spots in a tent where there is significantly less fresh air or flow.Not something you can easily gauge but if one side of tent is getting larger % of fresh air coming Into tent, it's one of those small details that may add up over time. Just a guess.
Do you have a exhaust setup too? Extraction fan sucking from one side of tent could be accelerating cellular respiration overnight on one side of the tent. At night the plant t makes alot of moisture vapor, each leaf once it spits out a tiny piece of moisture it sits on underside of leaf until air takes it away. Each leaf is Independent in that if air doesn't take it away production in that leaf will cease.
If for instance one side of tent has a gentle breeze drawing water vapor away all night it will be efficient.
If the other side is far from suction force of exhaust with 0 breeze, vapor will stay on leaf and production will slow as water cannot be released.
Very small environmental differences can build overtime into noticeable difference.
Could be absolutely down to genetics and nothing else, my brain says otherwise.
The slower water cycles through a plant the slower nutrients uptake, overtime leading to drifting phs as mineral content slowly increases, possibly what you see and the apparent differences.
Some plants are eating all their food at dinner,
Some are not, and it's accumulating within medium this is drifting the ph and making nutrient uptake more difficult.
I'd check your ph on lighter ones and compare.
Photosynthesis by day,
Cellular respiration by night.
Good luck.
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