Zigbee topic confusion

I have a Sonoff Zigbee Bridge flashed with Tasmota. The config is below. I have a couple of Ikea Vallhorn PIR sensors which communicate with HA via the Zigbee Bridge.

When I monitor the MQTT messages using MQTT-Explorer I see messages from the Vallhorn PIR sensors being published on two different topics:
zb/vallhorn-hall/Occupancy
and
tele/zigbee-bridge/vallhorn-hall/SENSOR

Given the way that the Zigbee Bridge is configured, I would expect that all messages would be published using the tele/zigbee-bridge/vallhorn-hall/SENSOR topic. Could anyone fill in my understanding of this, and explain why I am seeing zb/vallhorn-hall/Occupancy messages?

Please ignore this - I was being dumb. I had an automation which was publishing on the zb topic