Why my rolls are so drastically different now?

I remember my first rolls were just euphoria and energy in the body , and my mind was kinda sober but not , like it was very manageable. Now every time I roll I get this strong feeling like I'm dreaming and everything looks so dreamy , nostalgic and liminal. + Now every time I roll I get crazy visuals and extremely strong halucinations ( stronger than shrooms ) specialty in the comdown , I'm not complaining because I like it but I'm just curious why the drug effects changed so much. And yes I tested with re agent kist my last batches so I know it was pure mdma