buying item bug???

i was jus in a game where i bugged out, i had started to build sunfire cape, and it bugged out, i was able to buy the 3 pre items, but couldnt finish the item, i had more than enough gold, it was bugged out, i tried to close the buy window n reset it, but it wouldnt do, i even tried to rebase to see if it resets, couldnt....so i sold my pre items to buy some crappy other item which i was unhappy with.... than it happened with Randuin, i bought pre items, couldnt finish the final item....pls check in on this, costing me rank games....ty