140w grow on 18/6 and still flowerd on me

i got a plant under 140w hps ita about foot and a half tall i toped it 4 days ago and started lst on the lats and it flowerd on me WTF ???????

any one with a few years in the game who could help me out ????????

sounds like an auto strain if it flowered under 18/6 . If it has truly started flowering at 6 hours dark ... your just gonna have to run with it . With you topping 4 days ago though .. you sure its not just new growth ? a pic would help if possible