My brown paper bag flooring didn't dry flat. Why?

My brown paper bag flooring didn't dry flat. Why?

A Purposeful Path: My First Paper Bag Floor - A Test and Learn

A Purposeful Path: My First Paper Bag Floor - A Test and Learn

Brown Paper Bag Floor – Preserving the Harvest

Ayuda con el suelo/pared de papel marrón

Paper Bag Flooring - After the paper bag floor has been laid, drying - paperbagflooring.com

Brown Paper Bag Floor – Preserving the Harvest

Alek's floor. Brown paper bags. Looks super

What adhesive should I use to affix tile to formica?

Update more than 140 colored paper bag floor super hot - xkldase

Brown paper bag floor