MiningPoolHub Zcoin payout question.  Why do miners only get 28 of the 50 coins mined in the block?  Where do the other 22 Zcoin coins go?

Example:  

1. Here is link to Zcoin block explorer showing that for Zcoin block number 67472 the reward was 50.121 Zcoin. https://chainz.cryptoid.info/xzc/extraction.dws?1.htm
2. Here is link to MiningPoolHub page for the same Zcoin block number 67472.  https://zcoin.miningpoolhub.com/index.php?page=statistics&action=blocks
3. Those links show that the "amount" of Zcoin to be divided among the "shares" (the miners) for that block is just 28.060 Zcoin.  Where does the other 22.061 Zcoin mined in that block (67472) if not to the miners in the MPH pool that mined the block??