re: Nothing unusual about the slopes
Robert, if the feature you're refering to is indeed the small crater below Duck Bay, then it looks like a crater. It even has the same edge features to its left as the larger ones to the upper left of Victoria. Which would mean to me that both features occured/fell if you will, on the same type of soil. Except that the smaller one occured after Victoria was created and therefore it would, of course as Nick wrote, have a tendency to slope down towards Victoria.
From this image you posted above: