brownish

Hi y'all! Newbie here with first experience in growing whatsoever. My plant is in flowering, and today I've seen some flowers turning brownish. Is it normal or something is going wrong? I usually keep the plant in plain sunlight, but it's been a couple of rainy days and going forward weather...

My plant is only about 10 days in. I'm growing in a solo cup with Nature Care Organic MG Potting Soil. I watered last night with distilled water at a ph level about 6.0. Im growing under 3 BrightWhite 72W CFL at about 10 in away from the light on a 12/12 light cycle. Average temp is 85* with a...