DESS discharges battery at lowest price

[SmartVolt (Marcel den Butter)]

DESS is now discharging the battery (time 14:41), while the price is at its lowest point. Target SOC is 79%, battery has now 84%. Why?
Config:
3x5000 Multis, Smartsolar 250/70, Growatt 11kW solar, 1400Ah battery, Lynx Shunt