A big wave of miners are coming back, plus a load of new registrations today. We keep the stats on dashboard as last priority on tasks to allow payouts and block confirms to process faster, so dash stats are always delayed by about 10 minutes. We had an influx of over 400 miners in the last 2 hours, also assuming other pools are getting some more miners too, so net hashrate is fluctuating too. The most important stats are confirmed/unconfirmed earnings and blocks per hour and those are what counts the most.