Sonoff basic shows sensor values, but there is no sensor!

Pi4b, 2.5.12, sonoff basic with Tasmota 9.3.1

I am using this device in homeassistant mode (as many other basics in my environment)
This one device shows me sensor values, but there is no sensor attached!
Any idea what it can be?

2021-05-04 21:32:07.047 [vent.ItemStateChangedEvent] - mqtt_homeassistant_C81C78_583ffe5b_C81C78_C81C78_5Fstatus_sensor changed from 68 to 70