Why would 1gram of psilocybin cause an unexpectedly intense trip?

Has anyone ever had a much stronger-than-expected experience on a low dose of psilocybin?

I took exactly 1g from a batch of dried and blended mushrooms that I grew myself in lemon juice. I’ve used from this same batch multiple times before (same source, same preparation, same amount as previous occasions), and it resulted in a very intense, almost full trip — far beyond what I would normally expect from that dose.

For context:

- I’ve taken higher doses before (up to 5g of dried powder) and 35 grams of fresh without this level of intensity and from the same batch.

- I’m familiar with how my body usually responds but this time within 5 minutes of taking it I had strong sensations in my body and within 20 minutes, I had to lie down and was in a full on trip. I have never had to lie down before on a trip. Even when I have wanted to, I have always had to get back up because it was just never that deep for me.

- Nothing obvious was different in terms of how I took it and yet it was the most intense experience I've ever had. I completely left my body at one stage.

I’m trying to understand what could cause such a big variation in intensity from the same dose. I am not at all complaining as it was a beautiful insightful experience but I'm very confused as to how this happened

Has anyone experienced something similar, or have any insight into what factors might influence this?

Genuinely curious from a scientific/physiological perspective.