Did it dry in the sun very fast? Have you tried just scrunching it up with your hands to soften it back up again?

Also did you use much detergent?
It's 30 plus out so maybe? Mind you they took all day yesterday to dry still.

I actually noticed when it was dirty as I was chucking it in the wash. I've washed it again and it's hanging outside as we speak so I'll see what happens.

I use Eco Store washing powder, and only half a scoop... I haven't done the strip wash with the dish washing detergent on them yet.