Sorry to be disheartening but that virtual thingy looks like a load of nonsense.
If your L-L reading is 0.27 ohms (r1), N-N reading is also 0.27 ohms (rn) and your E-E reading is 0.45 ohms (r2) then there is no way on this planet that your R1+R2 reading is 0.74 ohms. Even though this simulator says 0.74 is correct, trust me it's not.
The CORRECT R1 + R2 is 0.18 ohms
If you believe to much in that programme you will fail big style.