So, I was recently having problems with the sensitivity of my Smart Effector. It would work fine once, and then randomly trigger while probing. Normally it would "finish" the cal, but return useless values. Other times it wouldn't even finish the cal.
After fiddling with the settings to no avail, I decided that it had to be electrical and I unplugged the hotend cooling fan before attempting the cal. That fixed it.
I've done at least a dozen Auto Delta Calibrations alternating with Mesh Grid Compensations with no false triggers.
Hope this helps others.