I'm sorry but I'm just not clear at all on what you're trying to do.
Can you post some kind of screen capture that illustrates what you're describing?
The following shows two video files being used. Video 2 is cropped and shown in the smaller box. This is an example that shows the clear delineation between the two video files. As you can see, I have cut "Test2.mp4" and it is selected. This is 400% magnification.
When I move the cursor left, this is what I get:
The screen focus has moved away from where it was in the previous screen capture.
In preparing these screen captures, I noticed that, after I make the cut, if I select the Video 1 clip and then go back and select the video 2 clip, this doesn't happen, the screen focus doesn't shift (it looks like any action that de-selects the video 2 clip may work). So that's a workaround although I would like to know if this is a bug or not.
I'm sorry. I don't know why that is happening.