BAK Revolver X4S question

[HS DAN]

I recently installed a BAK Revolver X4S on my Maverick. I later took it through a car wash, and got significant amounts of water in the back corners of the bed. I then put a light inside, and could see light when I looked in just above where the tailgate meets the side of the bed. It doesn't look like the cover was made to plug the gap there, nor does it look like the cover could solve it. It's the design of the truck bed/tailgate. This issue is probably the same on most all truck beds imho.
This was a high pressure car wash, not a brush type, so I'm not sure what will happen with normal rain, as I haven't driven it in rain yet.

Has anyone encountered this and possibly come up with a solution they can share here?

BTW, I love the truck and I love the cover! Would just like to make this improvement if possible.

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[Mabcim]

Yeah, it is pretty good gap. I added a tailgate seal.
This was my guide:

Todad works for Realtruck and is on these forums.