lower buds rotting???wtf

hey I have a few plants from week 2 to 4 they are big and healthy but some of the bottom buds pistils are getting a beige colour and some leaf drop next to the hurting buds,humidity is fine,heatfine,airflow plenty,i mix my nutes a little low so theres no burn,just wondering if its in the roots or what(soil)i was thinking of spraying with a bit of peroxide in water1:10 ????/ I dont know wtf just dont want it to spread

no worries - the pistals always go from white to brown to disappearing back into the plant. completely normal.

yeah ,no brother its more like the calyxes and pistils eff me,its some rott ,maybe ill grab some nutes to deter budrott i think that pirahna stuff does that,but i dont get why its rotting not at all.im not spraying anything