The plant is looking like it's having nutrient issues. Its easy to overdo it with phosphorus which you have a lot of in bat guano. If levels are too high it can actually affect the uptake of other nutrients such as calcium. Even organic inputs can cause these issues, and be a bit trickier to balance. It may need more potassium during flower, but I would also flush through a bit with ph'd water and add in other nutrients slowly to make sure the mix is not getting "too hot". Happy growing! 🌱👍