Dividends have been down across the board for me its not just on Cognitive but other mining operations too. Rising difficulty explains part of the reason why dividends are lower. You also have to remember 50% of dividends get held and reinvested in new hardware so that has to be taken into account when your calculating how much should get paid out. Plus their had to have been some fee to get listed on havelock initially which may explain why it was so low.
It could be better explained if the finances of this operation where made transparent.