I bet it's coming from above the lip seal on the door and running down to the bottom and in. I had that issue on my Palomino on the side lower compartment door and I had to replace the bulb seal with a larger one. The door had resistance closing but the seal at the bottom wasn't contacting the frame tight enough.
I didn't get a lot but I got a little and it was coming from above, running down the filon, over the door flange and down, into the compartment. I actually thought about adding drain holes in the aluminum floor but the bulb seal cured the issue. I keep my coleman lantern and levelling blocks in there along with my Rotapax fuel containers.