Hi folks, can anyone explain please what these placements are?
I mean the WebsiteID and Empty

Not sure what traffic source that is, but those blank and generic placements are usually visits from ad network compliance and your own test visits. That stuff is what shows as placeholders when the traffic isnt coming from a real live link where the values get replaced. Usually you can disregard it as traffic you aren't paying for.
Thanks, it's POP. Thanks a lot.