maybe, heat related "tacoing"
Your temp and rh are fine, so as it matures i bet it becomes more robust and you don't see this much.
I think you are over-doting... relax. It is good to look for problems. Don't overreact to small issues as no plant is blemish-free. Overall health and health of new grotht is good. Sometimes you have to let it progress it a bit to properly diagnose too, so i wouldn't do anything yet. 1.2VPD is nothing to worry about. (actually it is lower than that... leaf temps are cooler than atmosphere)
--- seperately
I know the peanut galery will shit their pants over thiss but.. there's no reason to start a tiny plant in a huge pot even if it is an autoflower. It just opens up risk to numerous problems that are 100% avoidable, otherwise. Potting up should never 'shock' a plant unless you use some retard-strength on the rootball and cause it to disintegrate. Gently placing a plant into a larger pot and covering it with more medium is not stressfull unless you cause it to be stressfull.
The hassle of watering a tiny plant in a big pot alone is worth doing it correctly. You either water too superficially or too much with a big pot / tiny plant. You end up training a fucked up rootbal and superficial roots, or it stays wet so long you grow weird microbes with greater potential for bad microbes getting a foothold.
I see you used a smaller seedling pot, that's good. You may want an intermediary step, too.
much easier to 1) fully saturate (**10% runoff in soilless**) and 2) wait for appropriate dryback/loss of weight before repeating. Simple... easy.. no risk or hassle.
Trying to water a small column of medium around tiny plant is a pain in the ass. Make sure it gets wet all the way down to the bottom or the drying pattern will cause superficial roots to form.