When I use a resistive network (two resistors in parallel or you can use a 10k potentiometer to make a voltage divider) and I scan several times, then in some cases I also get different results each time. I did a scan around the herpes zoster peak at 418kHz between 400 kHz and 450 kHz with a small step size of 100 Hz and the overall pattern looks very similar in the three scans (one with finger, two with resistors). I had herpes zoster 19 years ago when I was working on my Ph.D. in physics, maybe I got stressed out and the virus broke out.
For people on the forum who do not know what herpes zoster is, it is a virus that also causes chicken pox. I had chicken pox as a child. It can brake out once more if the immune system is depressed. It is assumed that after that second outbrake you have immunity against that virus for life.
According to some posts here on the forum, one should be able to see the virus in a DIRP scan with the F-Scan2 device. I couldn't see it in the data.
If you like, I send you my Excel files and you can judge for yourself.
Experimental evidence like this can't easily be disputed.