Ornated weapons have a different texture than their standard weapon counterparts when equiped. The icons for ornated weapons for your inventory simply haven't been made yet, so they mostly don't show an icon for it, use the standard icon for that type of weapon, or it plays funny tricks sometimes and may appear to use a seemingly random icon simply do to the fact that it doesn't have it's own yet.
Not sure why you made a post. What's the bug you're trying to report? If it's becuase it doesn't have an icon for your inventory slot, well, see above for the reason.
