Level/flat/parallel seem to be sources of confusion in RVing. The semantics of which will just get lost on some, so no point arguing aboot what the slope of your driveway is, how it drains, or how it affects precise measurements between the 2 surfaces.
Whether all 4 corners are perfectly “level” (theoretical “level towing” which does not need to be precise to the 1/2” over 30’, but more an order of magnitude thing) is irrelevant to setting it up for towing. You can get your tongue height based on how it’s sitting now. Again, approximate, not important to the magnitude of minor fractions of an inch.
On to the trailer. Since the bumper mimics your measurements, assuming a relatively “flat” planar pavement there are a few possibilities, taking out the “how it sits on the driveway” part.
First, TTs are generally not super rigid frames. Most frames are barely sufficient for the load rating and therefore will experience a good deal of flex.
1. Loading, something causing a little sag on the starboard aft corner.
2. Difference in tire pressure, minor suspension differences etc.
3. The trailer/frame is actually slightly twisted.
4. Any combination of the above plus in inconsistency in driveway.
Overall I would not be alarmed. Trailer is brand new. Document it with the dealer if you’re convinced it could be a problem and then load it up and beat it down the highway. And see if it gets better, worse or the same.