When I initially bought my house, my fireflies would re-spawn to a full swarm after around a day, but then they started to re-spawn in pretty much 10-20 minutes after I would catch them, and enough for at most two jars would come back. This was probably all through December to the start of January. But in the past week, they've been spawning much slower than usual. I caught a full jar last night, and at the moment there's only 5 fireflies.
Have the firefly mechanics been changed or something, or does spawning time just fluctuate?