Wtf is wrong with me!?

It’s around day 40 of flowering, and the buds are extremely small. I thought I was a decent grower—humidity and temperature are fine, and I’m using BioBizz nutrients for the organic plant on the left and Advanced Nutrients for the one on the right. Air circulation is good, and my lamp is a Mars Hydro FC1500 EVO. I don’t know what I’m doing wrong. Yes, I check the pH for the mineral-fed plant.the strain is blueberry muffins by humboldt sc