likely too much of something early on, but will be more robust within th ecoming days. Is it just the lower leaves? The older single-serrated will quickly be discarded by the plant or become mottled and neglected etc.
As long as you aren't mid-80s F you're likely fine on heat, even if it is causing some waves early on.
got a light meter of any kind? Would help i nfuture to avoid. Can raise lights abit and if it responds positively, you've got your answer.
Young plants often look ugly. Often times it's been feed too much or given too much light etc... but even so, it can be a little ugly in perfect conditions.