If you talk about direction IDK from which version but now when copy-pasting Factorio will rotate the position to match the new direction BUT will NOT update the direction.
So if the original inserter has direction = north and the copied to had direction = south Factorio will rotate the positions to match the direction.
If you want to have 2 identical inserters you should rotate the direction, but the mod needs to implement this behavior.
I added this option a while ago but managing copy-paste is not that easy so for now I removed that feature. (Smart Inserter)
I hope I clarified what's happening if I misunderstood something (Most likely) let me know,