does seem weird about the WW wouldnt a light leak that was strong enough to affect one plant affect the other plant that was right next to it also ????
just my 2 cents
Possibly not. There have been cases where a small gap around a door or wall-joint has let in a small amount of light that only hit one plant - or one branch of one plant.
Remember that parts of a plant can be affected by light conditions.
People have long sexed plants by "bagging" just one branch for 12 hours a day until that branch showed sex. Handy for outdoor grows when the person has no place inside to deal with clones.