Hundreds of ghost devices

Hi reddit, I really, really need your help.

I'm using Homa Assistant, with Zigbee2MQTT v2.6.1.1 and Mosquitto Broker v6.5.2

A few hours ago, I tried to re-add a sensor, and it all went straight to hell :)

I can't add anything now, I've got hundreds of ghost devices when I try to rejoin any device.

Something like that:

https://preview.redd.it/x2a1b0cwy0pf1.png?width=1512&format=png&auto=webp&s=745c5a12774671401ed86eca3d0533774835e071

I have deleted the topics in MQTT Explorer, but nothing changes. Restarting the broker and Zigbee2MQTT does nothing. If I press Permit Join, they all instantly come back.

Is this a common/known thing ?

On top of it, any other device on MQTT is now super low to respond, if at all, because of those devices trying to rejoin.

I don't understand what's happening...