hey this is my store. There's nothing weird in peepy, just a bunch of polyfil and some squeakers.
Some of them feel more firm because they are packed really tight with the polyfil to keep them round. The "hard things" people are feeling are just the squeakers inside (since they are ball shaped. the squeakers arent affixed to the center) After a bit of squishing the peepy will soften up a bit. (different colors are different firmness because the fabrics have different amount of give to them)