checking speaker ohms

Are you asking if this is possible or normal? Yes, it can happen.

It has no bearing on the information you need by measuring the coil.

yes a moving speaker will make huge fluctuations in your meter reading.  HUGE

it does not even have to be visible motion.  when a speaker that is not being driven by some source of power, it is now a microphone, any sound it hears moes the voice coil and this causes the coil to produce voltage, this fluctuation in voltage will make your meter swing severely, from near a dead short to probably 5 times it's actual resistance.

Thanks for explaining it. I first noticed it one a sub set up I'm not happy with, then when I checked some other speakers, they also moved around.

One pair I was checking was my Kicker Solobaric S12C's. One measured 8 but the other was 92 ohms. Does this mean it's blown?

I have a pair of Kicker Solobaric s12c subwoofers. One subwoofer measures 8 ohm, the other is measuring 92 ohms.

Does this mean it's blown? Why not an open circuit?

Another thing I forgot to mention. The 92ohm speaker seems to works well. They are wired in parallel and both speaker move the same, sound decent but that odd ohm reading.