Agreed, when off the torque convertor will only be half full, and the top section of the internal parts will be dry. When running, a certain volume of fluid is above the fluid level, flowing through passages, the torque converter, etc.
Again, usually the dipstick will show a high reading, and a low reading, on the two sides. Ignore the higher reading side, that is from the dipstick contacting the side of the tube. That fluid is from wiping fluid from inside the dipstick tube.
Only concern yourself with the one side of the dipstick, which is the lower reading. Learn which way to install the dipstick so that the low reading is on the side with the cross hatch marks. Then start to wipe the dipstick, install it, and read it. If you cannot read it, then wipe it again, and read it. Do it as many times as required until you learn how to read it.
Take your time, be sure that the fluid is not cold, and not very hot. Wipe the dipstick very dry, and quickly install it in the one proper way. Pull it out and quickly read it. Good luck,