Now the issue has been raised here in this ANN thread maybe Whirlwind will post here soon with an update including the missing daily rewards. To this point only two participants of the signature campaign mentioned missing anonymity mining rewards. If others calculate their balance and find themselves short they should also post about it.
Maybe it's better to turn off the "mining rewards" as an additional feature, at least until they implement it better and obviously, it's not set up well. This is not crucial for a mixer service it only unnecessarily casts doubt on the functionality of the whole mixing service.
As GazetaBitcoin calculated, there is a significant amount that can be "saved" with only 2000 satoshi per user, but why would anyone do it and think in such a way, when the very idea of staking came from the owner of a whirlwind? Just stop this option and continue working on mixing only.