That is not a good sign on a recently purchased used
vehicle.  Leakage is not "normal" even though it is not
unusual.  Even if it is over filled, it should not leak
unless it is a gallon or two over.  You need to ID the
source of the leak as well as you can visually.  That will
go a long way in determining how serious the problem may be.
It may be a simple external seal or gasket, or it may be
something that requires the trans to be removed.  The most
common leak on those was the front seal.  Fluid from there
will drip from the flywheel housing.  The only other points
of leakage there is the torque converter drain plug and the
pump seal ring.  The drain plug is the only thing you may
fix without dropping the trans.  Everything else is
external.

Lugnut