No - this is part of the algorithm that allows for high-diff blocks.  For a while after the high-diff blocks, the block reward is reduced to "pay for" the higher expense of the high-diff block.

See this message by Gatra earlier in this thread:  https://bitcointalk.org/index.php?topic=446703.msg18089292#msg18089292

(Edited to add:  oops, Ziiip beat me to it by 60 seconds.