The "ghost-item" bug happens where you try to interact with an item, a weapon for example, the ghost item will remain but will not be usable as it is a ghost item.

Only fix for this is a relogg but the odds of the occurence again is very likely to happen if you move the item yet again after relogg.

I've had to relogg multiple times due to this, it's very frustrating when you pick loot up and the loot is hidden under the ghost item.

Yeah it happens very often. The worst case should be in a shooting.

Today I experimented a little with these kinds of bugs. And the cause for these "ghost-items" appears to be interacting with items that are inside of containers within your clothing with items outside of that container.
There appears to be some similarities to the Full Plate Carrier and how it holds pistols.

For example, if you have a magazine in a Ammo Box within your backback and put it into the hotbar and reload your gun in your hands through the assigned hotkey. There will be one working magazine in your gun but the same one will still appear in your Ammo Box. Neither of those 2 magazines will be interatible until you restart/rejoin the server. But you will be able to shoot.

Hello Pakkos1 and thank you for the report.
This is a known issue (#0028701) and it has been scheduled for a fix.
Regards,
Geez