@egclassic 

Would you have any homeplugs or wifi extenders in use?   If so these could be using the powerline and therefore read as LAN connection on the router.  

  @Philbert 

Yes, I do have an extender, never thought of that. However, none of the devices in question are connect to the extenders wifi, if that matters. Like I said, it's not a big deal, everything works, just found it odd.