It's difficult to tell from your pic what the issue is. Maybe a more detailed shot of the problem area? A carpet store might have some sort of welting or joiner strip in gray or a complimentary color that you could use at the seam.
2005 X2, Viper Red, MCX, OJ TZ-X5 prop, PPass, rear 750 sacs, KGB, IBS, Bennett Wake Plate, custom wake shaper
(previous) 2001 X5, 1991 TriStar 190