Lay a sheet of clean cardboard under it and find out exactly where the drip is or "drips are" and go from there.
The guys have mentioned the common spots.
Dipstick tube O ring
Is the tube secured up above so it doesn't wiggle? If it isn't that will cause a leak.
shift lever seal
Front seal or pump gasket
Rear seal.
and or the pan gasket.
I think what is happening is that when it sits the converter bleeds back into the pan after a while and the fluid level raises to what ever is leaking.
