Automatic Litterbox Central

As a new user, I'm really having a good experience with my ScoopFree so far. However, I've noticed one consistent issue - some poop always seems to be stuck behind the rake in its resting position. How it gets there is a Mystery.

The cat goes where its supposed to. After this, presumably, the scoop free auto-magically runs after 20 minutes, the rake goes through the litter, and sweeps poop into the cardboard flap.

Invariably, however, I come back and find that the scoopfree has finished raking, the rake is back in its home position. Most of the poop is gone but, horror of horrors, some small pieces are now sitting BEHIND the rake in its resting position.

Anyone seeing this?

Yes, I tried the SF and this happened to me. Someone else reported this as well. At first I thought the poop was being caught between the rake and the trap door and some was being pushed up and over the rake as it moved under the trap. BUT... I witnessed my cat pooping almost on top of the rake and that may have been what was really happening... i.e., my kitty was overshooting the rake or his poop was landing on top and going over...