Looks like they both have a id_parent with a value of 1.
That means one is not the child of the other.
So both devices work as far as tripping / un-tripping with the magnet contact ?
I paired my strips a very long time ago, but I recall there was some talk of these strips later having issues with being paired altogether. EDIT here
Quick fix you could just hide one of them from the user interface.
On the main menu Apps - Develop Apps - Edit Startup LUA
You could enter this line using the device number of the one you want to hide and make vanish.
luup.attr_set("invisible","1",827)