Forum:Item texture problems

i got this item texture problem that really annoys me. the item texture shows a different item, or bugs out. but whenever i hold the item in my hand, it looks fine in my hand. example: a emerald pickaxe shows off a stone sword as a item in my inventory, but when i hold it in my hand, it looks fine, and it looks like im holding the emerald pickaxe. another example: a landmarker is shown as a chest in my inventory. and almost all of the mod items have this bug. please help me?