Yep all 6 are like this. I've done nothing but shoot at foam targets and I haven't missed, hit a rock, wall, or anything other than the targets.
I didn't notice this until I got a new target a few days ago. A foam Black Hole
http://www.blackholetarget.com/ , but I'm can't be sure they weren't like that before the new target. The new target is deffinatly higher density, but its still foam.
The softer foam target worked well until I had to replace it. I was just looking for a target that would last a while and not make a mess.
The Grizzlys sure weren't like this when I first got them a couple weeks ago.
I called Alaska Bowhunting and the two main guys are out at expos until the weekend. The person on the phone said they'll talk to me about replacing them when they get back.