Hey there Raijin.
I would encourage you first of all to check your filters to make sure you haven’t accidentally filtered out the sword.
Keep in mind as well that the character needs to be able to use the item for it to show. So your Mage for example wouldn’t see the two-hand sword in their list.
We have a handy overview on our support page that outlines the requirements and limitations.
If you find that the character who had the sword is otherwise eligible in all ways I would encourage you to open up a ticket so that our Game Masters can investigate further what happened to the Sword. And please also make sure to report it as a bug.
The more information we can provide to our developers the easier it will be for them to prioritize what issues to investigate further and hopefully identify potential issues.