I have a weird bug. When placing items the blue outline of the item stays there after placing the item. Some times the red outline stays there as well. This behavior stopped when I unloaded the plugin the outlines stayed until reloading the client . I have 70+ plugins so it could be a conflict, though don't know where to start. Wanted to use this to give new players to the server a starter base using Kits. 

Are you vanished while you are placing an item? I see this if I am building or placing something while vanished.

I myself noticed this bug a lot while just building bases so I think it might be a bug in Rust.
Could also maybe be something like UberTool or something similar (cannot remember this bug ever until my server got ubertool) but wouldn't really know what causes it, might even be CopyPaste but it seems to happen most ofter if you are building something and suddenly something interrupts the building which is unexpected (so Rust wouldn't really have to check for this behavior since it's not possible in normal play) but no clue actually. Might be just the walls popping in and out (paste for in, undo for out) of existence suddenly.

I believe this is the issue. Using vanish while placing items.