Minecraft crafting all items bug

When I play minecraft at the multiplayer (I play hunger games, so I need to craft items), and I try to craft items. For example swords, food, working items and stuff, and when I put the items that I need to use in order to craft stuff i need in the crafting table, they start jumping back to my inventory, and then back to the crafting table again, or jumping around in different spots at the crafting table when I try to pick up my item, after 10-15 tries i finaly get my item.. Or when I put the items in the crafting table the item that is supposed to be crafted doesn't show, nothing actiuoly shows. Just an empty blank. If I put the items away, and then put them back into crafting table again the item shows but I can't pick it becouse the items that are in the crafting table starts jumping in random places again... Please help! 😞