If you have uninstalled and re-installed the item pack, be sure you're putting the files in the correct places. Did you put the items.cfg in the main Feral-heart folder, and put the files inside of "Items" into your media>>items folder? Make sure you accept the offer to replace your items, or else there could be duplicate items, which may lead to more problems. If this doesn't work for you, you could try re-installing Feral Heart in case you accidentally skipped or missed a file in the download.