Perhaps, "And this is a very big IF", when you brought them inside the massive drop in lumen's would have normally kicked them into flower. OK, except you tried to keep them in vegetative growth stage and they had to revert back. Remind you, this is just theory if we are to think like a plant.... So just upon the fore mentioned adjustment you decide to switch the schedule (and nutes) to the autumn like flower stage. Now the poor confused plants have to switch yet again to flowering stage. Add another couple weeks and maybe this explains the retarded development.

Note: Absolutely NO offense please to mentally disabled folks out there. God bless us all..... Everyone.