One open firefly jar in my inventory, it has lost its lid, cant be opened as it says it already is, has 5 fireflies in it, tried refresh a bunch of times, tried dropping and picking up but still remains stubbornly topless and open.
ETA. as Lellie says its also a bit smaller than the other jars.
ETA again, I now have two firefly jars with this problem, the second had 7 fireflies :( also I believe its the exact same swarm as gave me the problem before. the one behind the pillar in peatland moors next to the sumwhat swamp sign post. I was able to use the fireflies it seems as the jar is now empty but also unusable.
ETA again I have now three jars, different swarm this time, sigh I have given up trying to gather fireflies for now :(