Commander slot in deck builder

{"ops":[{"insert":"Hi,\n\nIn the deck creation area I clicked the minus(-) button on the commander slot and it took the card out. I pressed the plus(+) button to see if it would add the removed card again. Instead the entire page went white. \nI tried to backtrack and then refreshed the page.\nWhen I went to load the deck again, there were no cards in it.\n\nCheers\n"}]}