Its not flowering bro its ok its just building preflowers in the growth period many plants do it i personally prefer a bigger pot to small one smallest i use is the 15ltr airpots if its a regular style pot 30ltr or up and i dont think its flowering cos rootbound when they do it you will know even some normal varieties dont like being root bound the sweet pink grapefruit and some others for example will bloom if its root bound so its not just a semi auto exclusive trait just more common in them i dont think its happening in your case your ok