The pool is now back to 864813 Ghash/s
All the Hoppers Skippers and Jumpers are coming back now the luck figures have returned to "normal"
While that would bring about a small reduction in dburdett84's reward, it would not explain the figure he sees.
It might be useful to learn what the preceding and following rounds look like: what the ratio of his shares to the total are normally compared to this one. A single line in isolation doesn't give us much to go on.