Sorry it took a while – I didn’t know that we sold these kits so I had to do some investigating…
After asking all the right people, we’ve agreed that the thick foam is mounted incorrectly. It has a hole in it that allows you place it so that the bottom of the port is flush with the bottom of the foam. This will also make it perpendicular with the sidewall of the loudspeaker – not angled as it is in the second photo.
Hope this helps.