IMO, the phenomenon you are observing probably has more to do with minor variations in concentration of the major cannabinoid (presumably delta 9 THC if you got the conditions on point) affecting the (local) refractive index than the differences in optical rotation (chirality) of the various cannabinoids in your jar.
see Schlieren lines for an explanation. Or watch this video
the advice you were given (warm it and homogenize) was sound.
Caveat: if you missed the mark, and isomerized a significant chunk of your delta9 to delta8 or delta10/10a, then @Soxhlet’s “optical rotation may vary” comes into play.
If your 3rd party analytics come back at less than 85% delta-9 THC (or CBD if that was your target), request a chromatogram so you can figure out what’s going on.