I queried Genesis Mining for it. Their official reply:
Genesis Ming reply:
"Thank you for contacting us.

Due to a high demand and ongoing maintenance, we have been experiencing some technical difficulties in the past 2 days. As a result, user balances were not shown correctly and the functionality of the website was reduced.

Our IT Team has resolved this issue and everything should be in order now. Payouts for missing mining days will be updated within the next 48 hours.

We apologize for this delay.
Thank you for your patience and understanding.
Best regards,
Genesis Mining Customer Service"