The fortune Enchantment isn't working

I find this extremely annoying because one day I was playing on my world finally got too level 30 too enchant and I got fortune 3 on my picaxe and I was happy as Larry. Then when I found 4 diamond ore blocls I whipped it out thinking I would get 10x the amount of diamonds I would normally get. But no I got 4 and it kept happening over and over again so please can you fix this. Oh and Gold won't smelt :,(