Increase influxdb logging in the openhab-cli
log:set TRACE org.openhab.persistence.influxdb
This way you can see what the influx binding is trying to do every change etc.
16:19:10.352 [TRACE] [b.internal.InfluxDBPersistenceService] - Tried to get item from item class class org.openhab.core.library.items.SwitchItem, state is ON
16:19:10.353 [INFO ] [smarthome.event.ItemStateChangedEvent] - BewegungsmelderKHlschrankGetrNke_MotionStatus changed from OFF to ON
16:19:10.358 [DEBUG] [b.internal.InfluxDBPersistenceService] - got OnOffType value 1
16:19:10.360 [TRACE] [b.internal.InfluxDBPersistenceService] - storing BewegungsmelderKHlschrankGetrNke_MotionStatus in influxdb value 1, BewegungsmelderKHlschrankGetrNke_MotionStatus (Type=SwitchItem, State=ON)