Is this behavior observed in KStars 3.3.6 or in the latest version on GIT or latest nightly? I spent about a week working on a whole bunch of PHD2 related issues, including something like this. But that was about a week ago, and so it wasn't in KStars 3.3.6.
In your video I don't see any information printing to the Ekos Guide Log. I would need to see if it has printed the messages saying whether or not KStars recognized that it has the same Camera that PHD2 has reported it is using, or if it found it was not found in Ekos. Also I don't know if this camera is setup in your profile in KStars. Can you send more information please.