it preflowered before this point.. you have pistils at terminals and bud sites. you got 7-8 more weeks at least.
if you didn't change light schedule, it's ust a big autoflower... if you changed 12/12 then it's probably a photoperiod. occasionally a photo seed gets mixed in, errant pollen in air, or some flaw in process etc...
you are on 18/6 according to diary, so it's just an "XL" auto with a longer vege period than normal.. .you'll get more weed this way.