I don't really show a big difference with a round in the chamber or not. Just a slight bit of the extractor out on the chambered round.
One thing I did notice on your video is that you're holding the pistol sideways. Does it do the same thing when held up-right?
Mine works perfectly when firing, when held up-right and manually cycled but when sideways the round just sort of falls out of the ejection port.
I think firing will tell the tale, but held up-right it should also eject.