Checked two of my stash bags today and it was covered in mold, it's been in the grove bags 4 and 6 weeks.
Thought this couldn't happen.
That sucks. Grove bags work, sometimes at least, but they have limitations. One of which is that weed eventually dries out in them if outside humidity is low - this I have confirmed for myself, much to my annoyance. The other might be that bud might re-hydrate in them in excess outside humidity. The two way humidification/dehumidification has limits it seems, and allowing moisture in as well as out might be one of them.
IMO, either the bud went in too wet (easy enough to do), or it got wetter after being in there due to excess humidity in the storage area. When you first load the bags, you should include a hygrometer and if humidity rises much above the target 62%, you need to open the bag up for a bit. It is very common for bud to still have moisture deep inside or in stems that continues to escape after the bud seems dry.
If your storage area stays very humid for a long time, you might want to find another place to store it. Once cured, I store my weed in glass mason jars in the freezer, and it last well with no mold risk in there. If you freeze bud, just thaw the container thoroughly before removing bud. If you open the container too early, you will get condensation on the bud, and you know where that may lead. You also need to be gentle with the jar while it is frozen if you don't want to knock off those frozen trichs.
Good luck with it, I hope you didn't lose too much of your stash.
