If you drag an item out of your belt or backpack inventory directly into a vendor (i.e. autoinjectors or trauma kits etc), the sprite got stuck on your screen. Little confusing and annoying. Only noticed this issue with medical supplies, no clue if it happen otherwise too, but I guess it does.
Steps to reproduce:
1. Drag a medical supply from your belt/backpack to a medical vendor for restock purposes.
2. Wonder why chat says it got restocked but it's still there.
3. Get annoyed as it overlaps with other items in inventory and just moves with your character when the inventory is closed.
/edit: I took some pictures as it appeared at my last round as CMO. As you can see, this Kelotane bottle appears in various bags, overlaps with the medical mask and is even visible after closing my bags.
Oh yes it is! All the credits and a huge thanks to Okand37 for these lovely marines!