Mine sometimes jumps around a bit also. Normally, I just ignore it but the last time it kinda bugged me. I built a Kanthal dual-coil on my Aromamizer. My Ohm's checker said 0.61. I put it on my Radius and dry burned it...settled on 0.57 and vaped it. Later, I put it on my IPV4S and it read it as 0.84! After a couple of hours, it settled down to 0.5. It only happens once in a while though.
A more annoying issue I have with my IPV4S is that when the battery gets down to about 20-30% I have to swap out because it seems to hit weaker.