Why is there such a difference between Pills and MDMA

I usually take MDMA (usually wait 2-3 months between), weigh out 150mg and a 75-150mg redose depending on how I’m feeling.

I’ve found that when I take pills (always half first), the come up is very intense and seems stronger, where as when I take my MDMA the come up is slow and smooth and doesn’t feel as strong and I feel more relaxed. Is there a reason for this?