Overlay Video Help

Hi I’ m trying to demonstrate a video overlay for a work project however weirdly I get a small amount of empty space on the frame. This isn’t there if I just place the video directly onto the object I want it to go on.

For example the video is 574x322px. I imported it onto the canvas then the Framed the selection - clipped the frame to contents. So when I manually place the overlay I get a pixel of space in the container how do I fix this? See attached.

Am I missing something?
Thanks Alan