Unexpected 2N6388G Darlington Transistor Emitter Voltage
If your drawing above is correct, I'd expect to see about 4 volts at the emitter with 5 volts on the base.  The circuit is an emitter follower, so the emitter voltage should be about two Vbe drops below the base voltage.

The 100K emitter resistor likely does not draw enough current to produce the full Vbe drops in the transistor.  You might try 1K or so as an emitter resistor for a more realistic base-emitter voltage drop.