Oristo, reference your inductor measurement above, Could you explain how you conducted this test? Did you recal the NanoVNA at each of your measurement ranges? Your test fixture set up isn't really a broad range test fixture. Did you lock down the position of your test clips and leads? I don't remember reading if the Nano firmware stores one single point/frequency calibration value, several over the specified frequency range or 101 points. What did your 51 ohm resistor look like over the 0.1-900 Mhz range after the calibration?
thanks,
Jim, KA6TPR
Starsekr