Our frontend servers met unexpected issues on 11th April, during that period you may get incorrect offline notifications and unable to visit SparkPool page. But our backend had been working well and finding blocks normally so your income did not be affected if your rigs were mining on your end.
The abnormal triggered liquidation manually that caused your income chart to fluctuate from 12:00 to 20:00 UTC, but your total income would not change.
We have now sorted all the problems out. SparkPool will reflect on this issue, continue to bring more stable and efficient mining pool services to the miners.
Sorry for the inconvenience and thank you for understanding.