When I got to this set today I found this.
All that was distributed was the grass pulled out of the hole and the trap was dug out all the way around. Not flipped out or fired as can be seen. What's in the pic is how I found it.
I tripped it and remade the set making dang sure that the trap was very well bedded.
I couldn't see a definitive track anywhere near the set, but it's on a pond dam and the dirt is pretty hard.

I take it thats part of your pan cover?

I just had this happen to me a week ago except in my case it was sheep's wool that was pulled out of the whole, couple days after I had a raccoon in the trap and haven't had that problem since

Yes, it was a coffee filter

I'm betting coon. What are bedding and covering with?

Either the coffee filter was showing or it smelled something on it.

Bedding with the local dirt that came out for the trap
Waxed dirt covering
Light grass chaff over the waxed dirt.

Coon!

There is an old saying down....You got to clean out the trash before you get to the good stuff. I'd saturate the area with coon sets. The more coons you get out of there the less chance of having a blown set.

Ol coon probably.

Coon will dig in soft dirt when everything around is hard