Why would I have a full on trip on just 1gram of psilocybin

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 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.