because iStick 20 actually fires at 1 full volt higher than the display indicates, long story... IOW, if you think you're at 3 volts, you're actually at 4 volts.
The 2.4 Ω reading is the resistance of your Evod coil, so that reading shouldn't change.
Have you tried turning the power off, waiting a bit and turning it back on? Sometimes that helps--when your iStick is confused.
Good luck.
Katya is correct. Using Evod coils on the istick (esp. the 20w) is a bit problematic with some of the evod coils you get, because istick really runs at 4v not 3v, and that will cause a rather 'hot' or 'burnt hit' vape at times.
I've only used 2.5ohm evod coils w/my istick 20, and
even then the mod is a little over powered for those single coil Evods.
You would be better off keeping your evods for your ego/spinner type batteries, which they work fabulously on! and upgrading to a nautilus or other clearomizer for your istick, IMHO.
It's sort of a mis match in technology what you are doing now. The Evods are
great clearomziers, but they are single coils and came out
way before much of the new battery technology which seem to require a little more "oooph!" in a clearomizer designed to take these newer batteries and higher voltages.