There will be some leakage around the edges, but should not be that severe. I have an HRX as well, and some clipping will tend to collect along the top edge near the door hinge.
Got any photos of the bag? I am just taking a stab, but maybe the bag is not properly installed onto the frame (seen it before).
More remotely, perhaps the frame is not square, or not sitting flush against the rear of the deck? Can you see any gaps when it is installed?
If all checks out, you may want to have a Servicing Honda Dealer inspect it carefully. You have warranty that would cover any factory defects. FYI, does not matter if you bought it from that dealer or not, they all are obliged to provide warranty service for all Honda products.
Here's a link to find a dealer in your area:
Find A Honda Dealer