If when assembling the trailer, the techs put one dinette seat an inch closer than designed, the cushions won't lay flat. An inch the other way and you have gaps. Over time the cushions will compress enough to fit more easily.
You aren't doing anything wrong and there isn't just one way to set them.
Wright and Penny
(with Fitz and Lizzie, the camping kitties)
2010 Tundra 4X4 5.7L V8
2014 Rockwood 2604WS
Life is a cruel teacher. She gives the test first; the lesson then follows.