Your repeating group is positioned at the top of the page, so that’s where it will be.
A floating group exists ‘above’ the page, and will ‘float’ on top of the page, so the behaviour in your video is exactly as expected, and as it should be.
If you want the repeating group to appear ‘lower’ on the screen than the floating group (and therefore to not be obscured by it), just set the top margin of the RG to be at least the height of the floating group.