Hello! If you consider this as a bug report it here
The item its not registered as an item. I have this issue before and to fix it just type /ah or any command that will show a gui. This will make the item deleted or rather disappear since it's not a registered item.
first make sure ur 13 yr old or more. Verify your phone number, then go to #link-account or smth different on jartexs discord then type /linkaccount on the jartexs minecraft server copy its code/token then type .linkaccount ( token ) on jartexs discord server. Done