Check the torque on the nuts toward the rear,
From your pics the 2 rear nuts both appear to have less threads protruding than the others.
If the torque is correct, remove the sump & determine the obstruction.

What sump gasket did you use? Was it PR3 or P72?
P72 has metal spacers made into it to prevent crush, PR3 does not.
Or perhaps the old ones are still present around the base of the studs causeing a double-up (& leak)