What were the drying conditions? My guess is flash dried till crispy on the outside and then tossed into jars, with no curing process
Its clearly the curing/drying process. Burping jars/tubs... the moisture in the buds distributes thru out the bud when sealed, from the stem, which holds the most moisture. Then you open it up and the moisture in the air, RH will evaporate and the moisture in the bud will suck back into the core. The curing process is about redistributing moisture until its uniform thru out the entire bud. I use portable cigar humidity meters, and do a short cure using tubs with a sealing gasket. After my 2-3 week short cure they are in the low sixties; 60 percent humidity will almost snap, and will not crumble into a joint, i like to trim, store and seal right around there and for smoking just a lil bit less like 56 or 57%..Also when its that low in RH humidity it can take a week for the reading to stabilize.
Really tho the drying environment should dictate the drying process to get optimal results. And on the topic of mold, if your plants have mold you will see mold in your buds. It really only molds right at first if the humidity is to high, past your initial drying if you let it go long enough and into tubs/jars you should be in the clear. If your getting mold late in your curing process you grew moldy weed.
real deal on curing is you have to dial it for where you are. different places call for different treatment to get optimal results depending on your temps, humidity, airflow, concentration of plant matter, and budget. plus all of us on here are scattered all over the place, indoor, outdoor, completely different elevations and climate zones.