WHEN I had a pontoon with two separate toons (meaning I now have a "U" toon) I did realize you need to cinch the straps with the toons slightly deflated then inflate to the point there might be a dent where the straps are.
This helps allot when putting the boat in colder water and the compressing of the air.
I think as everyone has mentioned, you have a cam that didn't close for some reason.

I am like Uncle Jesse though...I hate loose ends.